http://www.neonlightssigns.info/air-led/
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Bien-Air Unilite Model LED Dental Curing Light for Delivery |  |
0 Bid | US $200.00 | 1d 6h 47m |
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Air Pneumatic Cylinder Magnetic Reed Switch D-C73 w LED Indicator | |
0 Bid | US $6.49 | 2d 1h 58m |
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CS-30E Red LED Indicator Magnetic Reed Switch NO for Air Cylinder | |
0 Bid | US $10.04 | 2d 4h 41m |
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LED Light 2 Wired Air Pneumatic Cylinder Magnetic Sensor Switch | |
0 Bid | US $6.65 | 2d 5h 6m |
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D-A73 2 Lead Air Pneumatic Magnetic Reed Switch w LED Indicator | |
0 Bid | US $8.20 | 2d 10h |
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CS1-U Air Pneumatic Cylinder Magnetic Reed Switch w Red LED Indicator | |
0 Bid | US $9.86 | 2d 12h 18m |
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Mini LED ON AIR RECORDING studio TV RADIO HAM lighted sign used 120 volt light | |
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US $4.95 | 12h 31m |
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J392B LED Sign U.S. Air Force Military Bar Light Sign | |
0 Bid | US $.99 | 2d 17h 13m |
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Red LED Indicator 2 Led Pneumatic Air Cylinder Magnetic Reed Switch | |
0 Bid | US $7.46 | 2d 6h 38m |
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Red LED Indicator Air Cylinder Magnetic Reed Switch w 1.6M Lead Ccable | |
0 Bid | US $7.91 | 2d 12h 2m |
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Air Led
LCD/LED TV safe to ship by air?
I am sending an LCD/LED TV internationally to the US from Asia. Price is not a concern; I am wondering if it is safe to send it by air (because I have heard that plasma TVs have altitude issues). By ship, or by air? Are both shipping methods safe for LCD/LED TVs? Thanks to the person who can give me a polite, informative response!
i think it will be okay. i understand why plasma would be an issue but LED should be okay. you probably have warranty anyways right. you could always call your manufacturers customer service and ask to make sure.
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Bien-Air Unilite Model LED Dental Curing Light for Delivery | |
0 Bid | US $200.00 | 1d 6h 47m |
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Air Pneumatic Cylinder Magnetic Reed Switch D-C73 w LED Indicator | |
0 Bid | US $6.49 | 2d 1h 58m |
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CS-30E Red LED Indicator Magnetic Reed Switch NO for Air Cylinder | |
0 Bid | US $10.04 | 2d 4h 41m |
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LED Light 2 Wired Air Pneumatic Cylinder Magnetic Sensor Switch | |
0 Bid | US $6.65 | 2d 5h 6m |
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D-A73 2 Lead Air Pneumatic Magnetic Reed Switch w LED Indicator | |
0 Bid | US $8.20 | 2d 9h 59m |
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CS1-U Air Pneumatic Cylinder Magnetic Reed Switch w Red LED Indicator | |
0 Bid | US $9.86 | 2d 12h 18m |
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Mini LED ON AIR RECORDING studio TV RADIO HAM lighted sign used 120 volt light | |
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US $4.95 | 12h 31m |
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J392B LED Sign U.S. Air Force Military Bar Light Sign | |
0 Bid | US $.99 | 2d 17h 13m |
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Red LED Indicator 2 Led Pneumatic Air Cylinder Magnetic Reed Switch | |
0 Bid | US $7.46 | 2d 6h 37m |
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Red LED Indicator Air Cylinder Magnetic Reed Switch w 1.6M Lead Ccable | |
0 Bid | US $7.91 | 2d 12h 2m |
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led012-r ON AIR LED Business Neon Light Sign | |
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US $29.99 | 28d 15h 50m |
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New Kavo Style Fiber Optic w/ Coupling/Coupler【Fast High Speed Dental Handpiece】 | |
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US $105.00 | 12d 13h 31m |
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NEW LED Dental Bulb fit W&H Fiber Optic Handpiece SYNEA TA98L TA96L TOP AIR | |
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US $64.99 | 28d 35m |
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WELDTEC WT-17V-25R 150 AMP AIR C00LED TIG TORCH - 25' | |
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US $92.87 | 6h 37m |
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NEW LED 6-Inch 240 CFM Air Duct Inline Hydroponic Booster Fan Air Flow FREE SHIP | |
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US $32.99 | 13d 9h 55m |
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Dental Low speed handpiece Contra Angle LED self-power air motor internal water | |
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US $325.00 | 8d 23h 6m |
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LED 6-Inch 240 CFM Air Duct Inline Hydroponic Booster Fan Air Flow NEW | |
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US $31.99 | 17d 9h 9m |
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Air Products & Controls Single SPDT w/LED MR-101/C/R | |
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US $14.99 | 29d 10h 40m |
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Air Products 4-Position SPDT with LED in Metal Enclosure (Item # MR-104/C) | |
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US $41.78 | 29d 7h 36m |
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LED Bulb for Bien Air and Midwest Stylus Quick Connectors (Buy 3 get 1 Free) | |
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US $59.00 | 12d 10h 53m |
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MovinCool OfficePro36 36,000 BTU Portable Air Conditioner $6979.99 The MovinCool OfficePro36 portable air conditioner features a condensate drain tank full LED indicator and LCD display. |
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Shooting Chrony LED Lamps, 2ct $143.99 Chrony LED Lamps (C.L.L.) Works with all Shooting Chrony chronographs Front and rear lamp assemblies Use indoors & outdoors For any lighting condition 14" long when assembled Incl. front & rear lamp assemblies, diffusers, 16" wire rods, 120V/220V AC adapter (12V DC output @ 500MAH) Never get wrong velocities again! The Shooting Chrony LED lamp will shine the right light on any Shooting Chrony chronograph and give correct velocity readouts at dawn or dusk, with overcast skies as well as indoors. The Chrony LED Lamp quickly attaches to the skyscreens of any Shooting Chrony. No tools required. |
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Walther CSL50 Rechargeable LED Flashlight, Black $17.4 LED flashlight 20 lumen spotlight Twist on/off Rechargeable Ni-MH battery Anodized aluminum body Recharge by plugging it into your vehicle's cigarette lighter 2" long (2-3/8" long with cigarette lighter charging adapter) Black Never be without a light in your car! This compact LED flashlight plugs into your car's cigarette lighter, which is a 12V power outlet. Turn on your car, and the flashlight charges its battery. Turn off your car, and the charging stops. Includes a red-glow charging adapter. |
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Walther CSL50 Rechargeable LED Flashlight, Pink $17.4 LED flashlight 20 lumen spotlight Twist on/off Rechargeable Ni-MH battery Anodized aluminum body Recharge by plugging it into your vehicle's cigarette lighter 2" long (2-3/8" long with cigarette lighter charging adapter) Pink Seeing more and more pink these days? It's THE color to get. Never be without a light in your car! This compact LED flashlight plugs into your car's 12V power outlet -- the cigarette lighter. It charges while your car is running. When you turn off your car, it stops charging. Simple and convenient. Includes a red-glow charging adapter. |
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UTG 16mm IRB LED Flashlight, Integral Weaver Mounting Deck $65.94 UTG 16mm IRB LED flashlight Up to 90 lumens 1-piece, precision-machined aircraft-grade aluminum Integral Weaver mount CREE Q5 LED Tactical, self-defense bezel Integral reflector and light bulb for instant focusing Hard-anodized finish Ambidextrous, finger-adjustable on/off switch |
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Walther MTL 300 LED Flashlight, 130 Lumens $53.94 Walther MTL (Master Tactical Light) 300 flashlight White LED bulb Max 130 lumens Up to 275 yds spot focus useful range Up to 4,375 yds visibility (2.49 miles) On/off switch (1 click=large spot focus; 2 clicks=small spot focus; 3 clicks=off) Warning light (1 click + hold down=large repetitive spotlight; 2 clicks + hold down=small repetitive spotlight) Tactical bezel (useful for some self-defense purposes) Anti-scratch lens Integral reflector Use down to 0 deg. F Includes two 3V CR123A batteries and belt holster A clever tool! If you need to carry around a flashlight, this just might be the perfect one. The clip-on belt holster is easy to use and makes the flashlight available without having to fumble or wear a large utility belt. The Walther MTL 300 is a compact unit that will work in many situations, including hunting, camping and general security detail. |
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Walther RBL 800 Tactical LED Flashlight, 176 Lumens $57.54 Tactical LED flashlight 176 lumens Tactical bezel, pocket clip and lanyard Batteries included Flashlights with tactical bezels are also great for self-defense. Many police departments issue them. The body is shaped so it won't roll off the table. |
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Tactical LED Flashlight, 150 Lumens, 5 Functions, Handheld, Lanyard & Batteries $51.54 Tactical flashlight 5 functions: 3 brightness levels, strobe & SOS CREE Q5 LED 26mm integrated bulb reflector Push-button on/off tail switch Combat/tactical head Law-enforcement rated rolling stop shoulder 6V 150 max lumens (80 lumens/medium, 30 lumens/low) 2+ hrs battery operating time/high; 5+ hrs battery time/medium; 10+ hrs battery time/low 1" diameter 5.5" long 5.9 oz. Aluminum body Incl. 2 CR123A batteries & a lanyard This is an extremely useful and practical flashlight. If you haven't tried one of these terrific handheld lights, you're in for a big surprise. Not only is the light extremely bright, the tactical bezel on the head makes a dandy defense weapon! Put one in your glove compartment, tool box, nightstand and emergency preparedness kit. Women can easily fit one in their handbag. If you need a light, you've got it. If you need an emergency defense weapon, the UTG Tactical LED flashlight is a handy thing to have in your hand! |
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Shooting Chrony BB-Battery Pack, DC Power, Powers Shooting Chrony LED Lamps $119.94 BB-battery pack Powers Shooting Chrony LED lamps For places without electrical power Automatic overcharge protector Red LED light indicates the charger is in use Green LED light indicates a full charge 12V rechargeable battery delivers 2.3 amps/hr 18 hrs of continual use Overcharge protector Measure the velocities of your favorite airguns anywhere! The BB-Battery Pack powers Shooting Chrony LED lamps for more than 18 hours of continual use. Uses a 12V emergency power source that's compatible with most center-pin-positive cigarette lighter plugs such as those used by games, cellphone chargers, palmtop computers and flashlights. Automatic overcharge protector. |
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UTG Foregrip & Integral LED Flashlight, QD Cam Lever, Fits Weaver/Picatinny Rails $87.54 Foregrip & integral LED flashlight Quick-detach cam lever Fits any Weaver/Picatinny rail Aircraft-grade aluminum alloy Integrated reflector & lightbulb Ambidextrous push button on/off switch Best in class CREE Q5 LED Textured surface Bronze housing 1.43" dia. 5.17" high 12 oz. This tactical foregrip & LED flashlight adds versatility to your airsoft gun and offers you superior control in the battlefield. This grip/flashlight mounts on any Weaver/Picatinny rail equipped airsoft gun and attaches & detaches easily with a quick-detach cam lever. This grip/flashlight is an excellent airsoft accessory for cqb skirmish situations. Pick one up today! |
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UTG Tactical Pistol Flashlight, 90-Lumen CREE Q5 LED, Quick-Detach Weaver/Picatinny Mount $59.94 Tactical flashlight 90-lumen CREE Q5 LED bulb (16mm wide) 120+ mins battery operating time Integral quick-detach, lever lock Weaver/Picatinny mount Mount includes crossbar (fits metal or polymer guns) Ambidextrous on/off switch Built-in reflector Tactical bezel Hard-anodized aluminum 4.2 oz (with batteries) 3.05" long 1-year limited warranty Includes one CR123A battery, 2.5mm Allen wrench & manual Shine the light of day on your target with this tactical flashlight. Ideal for firearms, air guns and airsoft guns that have a Weaver/Picatinny accessory rail. WARNING: Avoid direct eye exposure. WARNING: Do not store this flashlight in a case or confined space where minimal heat dissipation may cause overheating and battery explosion. Always make sure the flashlight is turned off and cannot be accidentally turned on during storage or transportation. |
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NcStar 1x30mm LED Red Dot Sight, 1 MOA, Integral Weaver Mount $35.99 LED red dot sight 1x magnification 30mm objective lens diameter 1 MOA (1" click value @ 100 yds) 3 MOA dot size Unlimited field of view Unlimited eye relief 6.80 oz. 3.15" long Incl. extra 3V lithium battery (CR2032), lens covers & mounting tool Other features: 7-position rheostat Multiple brightness levels Integral Weaver mount This red dot sight by NcStar can increase the accuracy of your favorite air rifle, airsoft gun or firearm. The red dot has multiple brightness settings that ensure an accurate shot under any lighting condition. The integral Weaver mount lets you mount this on any Weaver/Picatinny rail equipped gun with the help of the included mounting tool. Pick one up today! |
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NcStar 1x42mm LED Red Dot Sight, 1 MOA, Integral Weaver Mount $35.99 LED red dot sight 1x magnification 42mm objective lens diameter 1 MOA (1" click value @ 100 yds) 3 MOA dot size Unlimited field of view Unlimited eye relief 6.80 oz. 3.15" long Incl. extra 3V lithium battery (CR2032), lens covers & mounting tool Other features: 7-position rheostat Multiple brightness levels Integral Weaver mount Increase the accuracy of any Weaver/Picatinny rail equipped air rifle, airsoft gun or firearm with this red dot sight by NcStar! The multiple brightness settings let you shoot accurately in any lighting condition. The red dot sight also includes a spare 3V lithium battery, lens covers and a mounting tool for easy installation on your gun. Pick one up today! |
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UTG Tactical Compact Pistol Flashlight, 120-Lumen CREE Q5 LED, Quick-Detach Weaver/Picatinny Mount $71.99 Tactical flashlight 120-lumen CREE R2 LED bulb 60+ mins battery operating time Integral quick-detach, lever lock Weaver/Picatinny mount Mount includes Posi-tab (3.6mmWx1.6mmH) to prevent movement Ambidextrous on/off switch Built-in reflector Tactical bezel Hard-anodized aluminum 3.9 oz (with batteries) 2.66" long 1-year limited warranty Includes one CR2 lithium battery, 2.5mm Allen wrench & manual Ideal for firearms, air guns and airsoft guns that have a Weaver/Picatinny accessory rail. Lightweight and is barely noticeable when mounted...but it's there when you need to light up a target. WARNING: Avoid direct eye exposure. WARNING: Do not store this flashlight in a case or confined space where minimal heat dissipation may cause overheating and battery explosion. Always make sure the flashlight is turned off and cannot be accidentally turned on during storage or transportation. |
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Tactical LED Flashlight, 150 Lumens, Handheld, Right-angle Head, Lanyard & Batteries $53.94 Tactical flashlight Push-button on/off tail switch Combat/tactical head Right-angle head CREE Q5 LED 23mm LED IRB bulb 6V 150 lumens 2+ hrs battery operating time .91" diameter 3.74" long 4.1 oz. Aluminum body Incl. 2 CR123A batteries & lanyard Great for shining the light of day in dark spots. Right-angle head makes it even easier to use the flashlight so you can quickly spin it around to quickly shine in new places. On/off tail switch has a positive feel. Don't be left in the dark! |
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UTG Tactical LED Flashlight, 200 Lumens, 5 Functions, Handheld, Lanyard & Batteries $69.54 Tactical flashlight 5 functions: 3 brightness levels, strobe & SOS CREE Q5 LED 37mm integrated bulb reflector Push-button on/off tail switch Combat/tactical head Law-enforcement rated rolling stop shoulder 9V 200 max lumens (100 lumens/medium, 50 lumens/low) 1.5+ hrs battery operating time/high; 3+ hrs battery time/medium; 6+ hrs battery time/low 1.07" diameter 7.13" long 9.8 oz. Aluminum body Incl. 3 CR123A batteries & a lanyard This is a very bright light, plus the tactical bezel on the head is a great defense weapon! Put one in your glove compartment, tool box, nightstand and emergency preparedness kit. If you need a light, you've got it. If you need an emergency defense weapon, you'll be glad you have the UTG Tactical LED flashlight in your hand! |
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UTG Tactical Pistol Flashlight, 23mm CREE Q5 LED IRB, Quick-Detach Lever Lock Weaver/Picatinny Mount $69.12 Tactical flashlight 150-lumen CREE R2 LED IRB bulb 120+ mins battery operating time Integral quick-detach, Max Strength Lever Lock Weaver/Picatinny mount Ambidextrous, finger-adjustable on/off switch Built-in bulb reflector (IRB) Tactical bezel Hard-anodized aluminum 5.7 oz (with batteries) 3.38" long 1-year limited warranty Includes one CR123A lithium battery, 2.5mm Allen wrench & manual Ideal for firearms, air guns and airsoft guns that have a Weaver/Picatinny accessory rail. Lightweight and suited for any tactical situation. While Leapers states this is a pistol flashlight, you can attach this to submachine guns, machine guns, rifles and carbines with Weaver/Picatinny scope rails. The only inconvenience is that there's no remote pressure switch, so you'll have to reach forward a good bit to turn this on/off. WARNING: Avoid direct eye exposure. WARNING: Do not store this flashlight in a case or confined space where minimal heat dissipation may cause overheating and battery explosion. Always make sure the flashlight is turned off and cannot be accidentally turned on during storage or transportation. |
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UTG Long Range Spot Focus LED Flashlight, Quick-Detach Integral Mounting Deck $95.99 Tactical flashlight 5-function LED flashlight 40mm IRB LED bulb 3 brightness levels (low/50 lumens, medium/100 lumens, high/200 lumens) Highly focused beam 800 yds effective illumination 90 mins. max battery operating time 3 settings: push-button on, twist-on, remote pressure switch Rolling stop shoulder 1.07" dia. body 7.13" long 9.60 oz. 6V Aircraft-grade aluminum body Incl. 2 CR123A batteries, remote pressure switch, push-button on/off tail switch, quick-detach Lock Lever Weaver/Picatinny mount & manual WARNING: Follow battery safety procedures when you use your flashlight. Leaving operating lights in gun cases or any other confined areas with minimal heat dissipation will cause overheating and possibly battery explosion. Always make sure your light is off and will not be accidentally turned on during storage or transportation. For products equipped with a pressure switch, improper placement of the pressure switch on your gun may activate your flashlight when stored in a gun case or other confined areas. Always make sure the pressure switch is fastened to your firearm in a way that it will not be accidentally pressed and activate your flashlight, causing overheating and safety issues. |
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NcStar 1x40mm LED Red Dot/Laser Sight, 1 MOA, Integral Quick-Release Weaver/Picatinny Mount $71.99 LED red dot/laser sight 1x magnification 40mm objective lens diameter 1 MOA (1" click value @ 100 yds) 3 MOA dot size Unlimited eye relief 11.3 oz. 4.35" long Incl. extra 3V lithium battery (CR2032) & mounting tool Other features: Fully adjustable built-in laser sight Five brightness settings for red dot sight Built-in quick-release Weaver/Picatinny mount Black anodized aluminum construction This red dot/laser sight by NcStar is great for enhancing the accuracy of your favorite firearm, airgun or airsoft gun. The laser sight is fully adjustable and the red dot has five brightness settings, letting you lock onto your target in any lighting condition with ease. The laser & red dot can be used individually or simultaneously. The quick-release lever lets you mount the red dot/laser sight on a Weaver/Picatinny rail. |
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NewAir AW-280E 28 Bottle Thermoelectric Wine Cooler $204.95 The NewAir AW-280E 28-Bottle Thermoelectric Wine Cooler features a touch screen, digital controls, and an internal LED light. |
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What led to Mangalore air crash?
Why is Air Pollution a Global Problem?
Scientists have estimated that every day, an average person inhales about 20,000 liters of air. Every time we breathe, we risk inhaling dangerous chemicals that have found their way into the air. Air pollution includes all contaminants found in the atmosphere. These dangerous substances can be either in the form of gases or particles. Air pollution can be found both outdoors and indoors. Pollutants can be trapped inside buildings, causing indoor pollution that lasts for a long time. The sources of air pollution are both natural and human-based. As one might expect, humans have been producing increasing amounts of pollutants as time has progressed, and they now account for the majority of pollutants released into the air.
Air pollution has been a problem throughout history. Even in Ancient Rome people complained about smoke put into the atmosphere. The effects of air pollution are diverse and numerous. Air pollution can have serious consequences for the health of human beings, and also severely affects natural ecosystems. Because it is located in the atmosphere, air pollution is able to travel far off places easily. As a result, air pollution is a global problem and has been the subject of both global cooperation and conflict. Some areas now suffer more than others from air pollution. Cities with large numbers of automobiles or those that use great quantities of coal often suffer most severely from problems of air pollution.
Ancient Greek and Roman thoughts began the environmental sciences. Major philosophers advanced differing views that affected others and shield their views for years to come. The early Greeks searched for a reasonable understanding of nature. The ideas they developed influenced Europe in the future. Thales of Miletus, the founder of the Ionian school, was the initiator of Greek philosophy on the environmental sciences. The Ionian school hoped to discover the nature of the universe, and how it came about. According to Thales, everything was composed of water and the combination of the sun and water was the source of life.
Empedocles (c.493-c.433 BC) argued that the universe was composed of four elements: earth, air, fire, and water, which combined in different ways and proportions to produce different results and products. In his Memorabilia, the Greek writer, Xenophon (c.428-c.354 BC) contends that the planet earth exists for people and the climate of the earth, and the living creatures on it, are for the benefit of humanity. Xenophon says ‘The earth was created by a god for people.’ His work later influenced Christianity. In Rome, Cicero (106-43 BC) wrote that nature should be controlled by humans. According to him the earth was designed for humanity, as was each different species.
In respect of the theory of the four elements, the Greek philosopher Aristotle (384-322 BC) added a fifth one: the heavens. After breaking with Plato (429-347 BC), Aristotle thoroughly investigated the natural world. He thought that the earth could be divided into sections defined by the amount of heat each received, and that people could only live in the more inhabitable areas. Aristotle accepted the theory that underground wind caused volcanoes and earthquakes. He understood the origins of rivers and believed in a pattern of rainfall. Teleology, which explained things in terms of their purpose, was a major part of Aristotle's theory. It caused him to heavily research reproduction. Aristotle's Historian Animalium details over 500 species, examining common characteristics between the species. Throughout the ancient periods, interest in botany grew because of its relation to medicine. Many philosophers advanced varying theories that would affect Europe in later years.
Today, there are a vast number of environmental problems, all with unique causes and consequences. Some people have said that Christianity is one of the primary causes of the degradation of the environment. Lynn White has said that the modern destruction of the environment can be attributed to Christianity. According to White the Biblical belief that nature, seen as inferior to people, can be controlled by man, has brought a lack of respect for the sacredness of the environment. White would also argue that Christianity is greatly responsible for the advent of Western science and technology. Modern technology has clearly been one of the main sources of environmental difficulties.
The Judeo-Christian notion of nature is that it is not sacred like God. Man, however, is believed by this group to be made in God's image, and can therefore shape nature as God would. There are some who would disagree with this application of Christianity. Those who believe in "stewardship" would say that people must respect and not destroy nature, not overexploit natural resources, and allow other animals to live in nature as well. Many important theological thinkers would agree with this version of Christianity. Calvin said that man is the steward of God's earth, and has no right to exploit and destroy it. Also, St. Thomas Aquinas said that man had some responsibility towards animals. Christianity also favors the environment in some respects. To the benefit of the environment, the religion encourages caring for other people, including those of the future, and some level of respect for the environment.
There are many different chemical substances that contribute to air pollution. These chemicals come from a variety of sources. Among the many types of air pollutants are nitrogen oxides, carbon monoxides, and organic compounds that can evaporate and enter the atmosphere. Air pollutants have sources that are both natural and human. Now, humans contribute substantially more to the air pollution problem. Forest fires, volcanic eruptions, wind erosion, pollen dispersal, evaporation of organic compounds, and natural radioactivity are all among the natural causes of air pollution.
Usually, natural air pollution does not occur in abundance in particular locations. The pollution is spread around throughout the world, and as a result, poses many threats. Though some pollution comes from these natural sources, most pollution is the result of human activity. The biggest causes are the use of fuels in power plants and automobiles that combust fuel. Combined, these two sources are responsible for about 90% of all air pollution in the United States. Some cities suffer severely because of heavy industrial use of chemicals that cause air pollution. Places like Mexico City and Sao Paulo have some of the most deadly pollution levels in the world.
Air pollution is responsible for major health effects. Every year, the health of countless people is ruined or endangered by air pollution. Many different chemicals in the air affect the human body in negative and destructive ways. Just how sick people will get depends on what chemicals they are exposed to, in what concentrations, and for how long. Studies have estimated that the number of people killed annually in the US alone due to environmental pollution-related diseases could be over 50,000. Older people are highly vulnerable to diseases induced by air pollution. Those with heart or lung disorders are under additional risk. Children and infants are also at serious risk. Because people are exposed to so many potentially dangerous pollutants, it is often hard to know exactly which pollutants are responsible for causing sickness. Also, because a mixture of different pollutants can intensify sickness, it is often difficult to isolate those pollutants that are at fault.
Many diseases could be caused by air pollution without their becoming apparent for a long time. Diseases such as bronchitis, lung cancer, and heart disease may all eventually appear in people exposed to air pollution. Air pollutants such as ozone, nitrogen oxides, and sulfur dioxide also have harmful effects on vital systems. They can kill plants and trees by destroying their leaves, and can kill animals, especially fish in highly polluted rivers. Air pollution has many disastrous effects that need to be checked and curbed prudently. In order to accomplish this, scientists, environmentalists, and governments, are using or testing a variety of methods aimed at reducing pollution. There are two main types of pollution control. Input control involves preventing a problem before it occurs, or at least limiting the effects the process will produce. Five major input control methods exist.
Output control, the opposite method, seeks to fix the problems caused by air pollution. This usually means cleaning up an area that has been damaged by pollution. Input controls are usually more effective than output controls. Output controls are also more expensive, making them less desirable to tax payers and polluting industries. Current air pollution control efforts are not all highly effective. In wealthier countries, industries are often able to shift to methods that decrease air pollution. In the United States, for example, air pollution control laws have been successful in stopping air pollution levels from rising. However, in developing countries and even in countries where pollution is strictly regulated, much more needs to be done.
Over the past years, human energy consumption has risen dramatically. The rise in use of energy resources has meant increasing costs and the depletion of non-renewable supplies. These and other factors have led people to try to use energy in a more efficient manner. The First Law of Thermodynamics says that energy can be transferred between forms, but not created or destroyed. The Second Law of Thermodynamics says that usage of heat to perform work inevitably causes some heat to be lost to the surrounding environment. As a result, perfect efficiency in energy use is impossible.
For many things and devices that use energy, a maximum efficiency limit exists. A four-cycle internal combustion engine can achieve at most 54% efficiency, while a diesel engine can reach 56%. Steam engines only perform at 32% efficiency. In reality, engines are considerably worse than this due to designs that prevent achievement of maximum efficiency. If one includes all devices that use energy, about 85% of energy in the US is lost due to inefficient usage. Many low-efficiency devices exist because when they were developed, energy costs were very low. Only later, when energy costs rose, did it make sense to be more energy efficient.
Devices that increase efficiency often are priced higher than those that perform inefficiently. However, because less energy is used and the devices often last longer (such as fluorescent light bulbs), the efficient devices are sometimes cheaper in the long run. Governments are trying to promote efficient energy use for the sake of our future and their future generations who may be deprived by us of chances to generate air pollutants.
About the Author
Dr.Badruddin Khan teaches Chemistry in the University of Kashmir, Srinagar, India.
