Low-level ozone exposure found to be lethal over time

An 18-year study shows an increased annual risk of death from respiratory illnesses, depending on the pollution level. It goes beyond studies that linked brief ozone spikes to short-term effects. Ozone pollution is a killer, increasing the yearly risk of death from respiratory diseases by 40% to 50% in heavily polluted cities like Los Angeles and Riverside and by about 25% throughout the rest of the country, researchers say.

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