Volatile Organic Compounds- VOCs are organic compoundsthat can vaporize easily at ambient temperatures. Some VOCs are highlyreactive and play a critical role in the formation of ozone. OtherVOCs have adverse, chronic, and acute health effects. In some cases,VOCs can be both highly reactive and potentially toxic. Sources ofVOCs include motor vehicle exhaust, waste burning, gasoline marketing,industrial and consumer products, pesticides, industrial processes, degreasingoperations, pharmaceutical manufacturing, and dry cleaning operations.
Some carbonyls are highly reactive and play a critical role in the formationof ozone.
Other carbonyls have adverse chronic and acute health effects. In some cases, carbonyls can be both highly reactive and potentially toxic. The major sources of directly emitted carbonyls are fuel combustion, mobilesources, and process emissions from oil refineries. PAHs are believed tobe carcinogenic with no identified threshold level below which no adversehealth effects occur. In California, the major sources of PAHs arecombustion sources.