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.
Danville is a city in Vermilion County, Illinois, United States. It is the principal city of the 'Danville, Illinois Metropolitan Statistical Area' which encompasses all of Danville and Vermilion County. As of the 2010 census, the city had a total population of 32,467. It is the county seat of Vermilion County. Danville is the 14th-most populous city in Illinois, outside of the Chicago Metropolitan Area. Danville was founded in 1827 on 60 acres (240,000 m2) of land donated by Guy W. Smith and 20 acres (81,000 m2) donated by Dan W. Beckwith.