Sources are generally divided into human-made (anthropogenic) and natural categories: :
) react with Volatile Organic Compounds (VOCs) in the presence of heat and UV radiation. 2. Major Sources of Pollution Air Quality Control: Formation and Sources, Dis...
: Internal combustion engines in cars, trucks, and airplanes are responsible for up to 80% of urban pollution, emitting COcap C cap O NOxcap N cap O sub x PMcap P cap M Natural Sources : These include volcanic eruptions (
: Dispersed activities such as agricultural fertilizer use (releasing ammonia) and the use of household products (VOCs). Natural Sources : These include volcanic eruptions ( SO2cap S cap O sub 2 and ash), wildfires (smoke and PMcap P cap M ), and biological decay ( CH4cap C cap H sub 4 3. Dispersion Factors Examples include Carbon Monoxide (CO) from vehicle exhaust,
: Large-scale industrial facilities, power plants, and refineries release significant amounts of SO2cap S cap O sub 2 and heavy metals like lead.
: These are emitted directly from an identifiable source. Examples include Carbon Monoxide (CO) from vehicle exhaust, Sulfur Dioxide ( SO2cap S cap O sub 2