Dispersion refers to how pollutants spread and dilute in the atmosphere. It is determined by several critical environmental factors: Air Pollution and Your Health
) react with Volatile Organic Compounds (VOCs) in the presence of heat and UV radiation. 2. Major Sources of Pollution
: 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
) from power plants, and from construction or wildfires.
: These are emitted directly from an identifiable source. Examples include Carbon Monoxide (CO) from vehicle exhaust, Sulfur Dioxide ( SO2cap S cap O sub 2
: 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
Air pollutants are categorized by how they enter the atmosphere:
: These form in the atmosphere through chemical reactions between primary pollutants and other atmospheric components, often catalyzed by sunlight. A prominent example is Ground-level Ozone ( O3cap O sub 3 ) , or smog, which forms when nitrogen oxides ( NOxcap N cap O sub x
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