在化石燃料燃烧期间，全世界最常见的温室气体二氧化碳被排放到空中，同时排放的还有未经完全燃烧并在大气中发生化学反应形成细微颗粒物的固体和气体颗粒物（主要是二氧化硫和氮氧化物 ） 。
During fossil-fuel combustion, carbon dioxide, the world’s most prevalent greenhouse gas, is emitted into the air, along with particles of incompletely combusted solids and gases (mainly sulfur dioxide and nitrogen oxides) that react chemically in the atmosphere to form fine particulate matter.