2. The deadly mix of extreme heat and air pollution

Illustration of patients' hands, smokestacks, and abstract shapes.
Illustration: Maura Losch/Axios

The combination of extreme heat and air pollution is extremely lethal, and this noxious mix is likely to become more common as global warming worsens.

The big picture: It has long been known that particulate pollution emitted from car tailpipes, factories and power plants can aggravate chronic health problems and prove deadly. Add extreme heat, and the threat is especially dangerous.

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