The following table summarizes the major sources of these pollutants. Carbon oxides Carbon Monoxide (CO) :
Forest fires and decaying organic matter; incomplete combustion of fossil fuels (about two-thirds of total emissions) and other organic matter in cars and furnaces; cigarette smoke.
森林火灾和腐烂的有机物质;不完全燃烧矿物燃料（约占三分之二的总量）和其他来自汽车和炉的有机质;香烟烟雾
Carbon dioxide (CO2) : Natural aerobic respiration of living organisms; burning of fossil fuels
自然有氧呼吸的生物体; 燃烧化石燃料
Sulfur oxides (SO2 and SO3) ：：：：Combustion of sulfur-containing coal and oil in homes, industries and Power plants; smelting of sulfur-containing ores; volcanic eruptions 家庭、工厂和发电厂燃烧含硫的煤和石油；冶炼含硫矿石；火山爆发
Particulates dust soot and oil : 煤烟粉尘颗粒物和石油
forests fires , wind erosion, and volcanic eruptions; coal burning; farming, mining construction, road building ,and other land-clearing activities; chemical reactions in the atmosphere; dust stirred up by automobiles; automobile exhaust; coal-burning electric power and industrial plants
森林火灾，风蚀，和火山爆发; 燃煤; 农业，采矿工程，道路建设，以及其他土地清理活动; 大气中的化学反应；汽车引发的粉尘；汽车尾气；燃煤电力厂房和工业厂房
Nitrogen oxides (NO and NO2): High-temperature fuel combustion in motor vehicles and industrial and fossil fuel power plants; lighting 高温燃料燃烧机动车辆，工业和矿物燃料发电厂，照明
Photochemical oxidants 光化学氧化剂
Sunlight acting on hydrocarbons and nitrogen oxides 碳氢化合物和氮氧化物在阳光下反应
Hydrocarbons 碳氢化合物
Incomplete combustion fossil fuels in automobiles and furnaces; evaporation of industrial solvents and oil spills; tobacco smoke; forest fires; plant decay (about 85 percent of emissions ) 不完全燃烧化石燃料的汽车和火炉；蒸发的工业溶剂和石油泄漏；烟草烟雾；森林火灾；植物的腐烂（大约百分之85的排放）
Pesticides and herbicides : Agriculture; forestry; mosquito control农业林业;蚊虫控制
Asbestos:石棉
Asbestos mining; spraying of fireproofing insulation in buildings; deterioration of brake linings 石棉开采;防火隔热建筑的喷漆;制动片的变质
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