Key Concepts. Photochemical smog is a type of air pollution produced when sunlight acts upon motor vehicle exhaust gases to form harmful substances such as ozone (O. Photochemical smog formation requires the following conditions: 1  a still, sunny day. 2  temperature inversion (pollutants accumulate in the lower inversion layer).
Chebanse, Illinois. Chebanse is a village in Iroquois and Kankakee counties in the U.S. state of Illinois. The population was 1,148 at the 2000 census, and 1,088 in 2009. The Kankakee County portion of Chebanse is included in the Kankakee-Bradley, Illinois Metropolitan Statistical Area. Contents.
Sponsored Topics. Elgin ( /ÉldÊÉ¨n/) is a city in northern Illinois located roughly 40 mi (64 km) northwest of Chicago on the Fox River. Most of Elgin lies within Kane County, Illinois, with a portion in Cook County, Illinois. As of the 2010 census, the city had a total population of 108,188, making it the eighth-largest city in Illinois and the 241st largest city in the United States.