13-06-2012, 04:09 PM
Fundamentals of Air Pollution and Motor Vehicle Emissions
Fundamentals of Air Pollution.ppt (Size: 240 KB / Downloads: 81)
What Causes Air Pollution Today?
Stationary Sources
• Combustion of fuels for power and heat
• Other burning such as incineration or forest fires
• Industrial/commercial processes
• Solvents and aerosols
Mobile Sources
• Highway vehicles: cars, trucks, buses and motorcycles
• Off-highway vehicles such as aircraft, boats, locomotives, farm equipment, RVs, construction machinery and lawn mowers
Primary Types of Air Pollutants
• Carbon Monoxide (CO)
• Volatile Organic Compounds (VOCs)
• Oxides of Nitrogen (NOx)
• Sulfur Dioxide (SO2)
• Particulate Matter (PM10)
• Lead (Pb)
Carbon Monoxide(CO)
• Odorless, colorless gas
• Caused by incomplete combustion of fuel and air
• Most of it comes from motor vehicles
• Reduces the transport of oxygen through the bloodstream
• Affects mental functions and visual acuity, even at low levels
• Improvements are being made but there are still problems in some urban areas
GlobalWarming
• Certain gases in the troposphere absorb some of the infrared radiation reflected from the earth
• Carbon Dioxide is the major one (50%).
• Others include methane (18%) and CFCs (14%). CFCs also are responsible for destroying the stratospheric ozone layer
• The United States produces over 20% of the world's "greenhouse" gases