Background: Air pollution can also indirectly cause other health issues and even deaths. Air pollutants can cause an increase in cancer including lung cancer, eye problems, and other conditions. For example, using certain chemicals on farms, such as the insecticide DDT (dichlorodiphenyltrichloroethane) and toxic PCBs (polychlorinated biphenyl), can cause cancer. Indoors, pollutants such as radon or asbestos can also increase your cancer risk. Lastly, air pollution can lead to heart disease, including heart attack and stroke.

Situation: Mark moved from the country to a large city. Since moving to the city he noticed that he was exposed to a lot more smog and other air pollution. When he turned 60 he found out he had lung cancer even though he had never smoked.

Question: Is Mark's cancer risk higher or lower in the city?

Situation: Mark moved from the country to a large city. Since moving to the city he noticed that he was exposed to a lot more smog and other air pollution. When he turned 60 he found out he had lung cancer even though he had never smoked.

Question: Is Mark's cancer risk higher or lower in the country?

Situation: Mark moved from the country were he worked in a retail store to a large city were he worked in a factory. Since moving to the city he noticed that he was exposed to a lot more smog and other air pollution. When he turned 60 he found out he had lung cancer even though he had never smoked.

Question: What contributed to Mark's lung cancer?

Situation: Mark moved from the country were he worked in a retail store to a large city were he worked in a factory. Since moving to the city he noticed that he was exposed to a lot more smog and other air pollution. When he turned 60 he found out he had lung cancer even though he had never smoked.

Question: Is Mark at higher or lower risk for heart disease in the city?

Situation: Mark moved from the country were he worked in a retail store to a large city were he worked in a factory. Since moving to the city he noticed that he was exposed to a lot more smog and other air pollution. When he turned 60 he found out he had lung cancer even though he had never smoked.

Question: Is Mark at higher or lower risk for heart disease in the country?

Situation: The cities smog [problem had been growing worse for years. It seemed like there was more traffic everyday. Mark was thinking about moving out of the city.

Question: Is Mark at higher risk for lung cancer in the city or country?

Situation: The cities smog [problem had been growing worse for years. It seemed like there was more traffic everyday. Mark was thinking about moving out of the city.

Question: Is Mark at lower risk for lung cancer in the city or country?

Situation: The cities smog [problem had been growing worse for years. It seemed like there was more traffic everyday. Mark was thinking about moving out of the city.

Question: Is Mark at lower risk for repository diseases in the city or country?

Situation: The cities smog [problem had been growing worse for years. It seemed like there was more traffic everyday. Mark was thinking about moving out of the city.

Question: Is Mark at higher risk for repository diseases in the city or country?