Define criteria pollutants with example 

Criteria pollutants are a group of six common air pollutants that are regulated by the United States Environmental Protection Agency (EPA) under the Clean Air Act. These pollutants are considered to be harmful to human health and the environment, and their regulation is intended to protect public health and the environment. The six criteria pollutants are:

1. Carbon monoxide (CO)

Carbon monoxide is a colorless, odorless gas that is produced by the incomplete combustion of fossil fuels such as gasoline, diesel, and natural gas. It is a toxic gas that can cause headaches, dizziness, nausea, and other health problems. Carbon monoxide is regulated by the EPA because it can contribute to the formation of ground-level ozone, which __________ _____ __________ _____ __________ _______ _________.
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