Smog

Characteristic coloration for smog in California in the beige cloud bank behind the Golden Gate Bridge. The brown coloration is due to the NOx in the photochemical smog.

Highland Park Optimist Club wearing smog-gas masks at banquet, Los Angeles, circa 1954

Smog is a type of air pollutant. The word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky fog. The word was then intended to refer to what was sometimes known as pea soup fog, a familiar and serious problem in London from the 19th century to the mid 20th century. This kind of visible air pollution is composed of nitrogen oxides, sulfur oxides, ozone, smoke or particulates among others (less visible pollutants include carbon monoxide, CFCs and radioactive sources). Man-made smog is derived from coal emissions, vehicular emissions, industrial emissions, forest and agricultural fires and photochemical reactions of these emissions.

单词	Photochemical pollution
释义	Photochemical pollution 英语百科 Smog Smog is a type of air pollutant. The word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky fog. The word was then intended to refer to what was sometimes known as pea soup fog, a familiar and serious problem in London from the 19th century to the mid 20th century. This kind of visible air pollution is composed of nitrogen oxides, sulfur oxides, ozone, smoke or particulates among others (less visible pollutants include carbon monoxide, CFCs and radioactive sources). Man-made smog is derived from coal emissions, vehicular emissions, industrial emissions, forest and agricultural fires and photochemical reactions of these emissions.
随便看	Brachysomophis porphyreus Brachyspathus brachysphenocephaly Brachyspira Brachyspira aalburgi Brachyspirifer brachysporiella gayana brachysporiella pulchra Brachysporium brachysporium ananassae brachysporium arecae Brachysporium blotch of rice brachysporium echinochloae brachysporium marantae brachysporium oryzae brachysporium rytilicis brachysporium sesami brachysporium syntherismae brachysporium yamadaeanum matsuura brachysporous brachystachya Brachystachys Brachystachyum Brachystachyum densiflorum brachystachyus

Photochemical pollution

Smog