1) Explain how acid deposition may develop from a primary air pollutant released from cars. 2) Compare and contrast photochemical smog and industrial smog

3) Identify a federal agency responsible for enforcing air quality standards.

2. Industrial smog comes from, clearly, industrial processes. It concentrates in urban areas and is formed from sulfur dioxide (mostly from burning coal), water droplets, and other particles such as dust. Photochemical smog is a mixture of all other pollutants, but mostly VOC's and nitrous oxides.

3. Environmental Protection Agency (EPA), agency of the U.S. government that sets and enforces national pollution-control standards.