Three out of four of the world’s highest-density cities are in rapidly developing countries, where vehicle pollution is high. In Central Europe alone, 21,000 deaths are tied to air pollution each year. The concentration of photochemical pollutants, such as ozone, tends to increase with warmer temperatures. Ozone damages lung tissue and is especially harmful to people with asthma and other lung conditions.
 | Increased Air Pollution Air pollution in high-density cities can be a health hazard to individuals with asthma. Photochemical pollutants tend to increase with warmer temperatures. |
A 1995 heat wave killed more than 500 people in the Chicago area, and heat intensity is likely to rise in the future. Statistical studies estimate that a temperature rise of 2°F could double or triple the number of heat-related deaths in Atlanta, in part because the heat index will increase exponentially as temperature rises. But warmer weather may save lives in the winter by reducing hypothermia and driving-related fatalities.
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