A recent MIT study directly attributed air pollution to 200,000 premature deaths in the U.S. every year, meaning the quality of our air has never been more important. The Respiratory Hazard Index, used for this template and to answer this question, combines various air pollutants into an index of 1. In this instance, higher is worse–meaning there is a higher concentration of toxins in the air of that place. The data used to compile this template were created using information from the EPA's 2011 NATA ambient concentration, exposure concentration, and risk estimates. The Respiratory Hazard Index shows the risks for multiple air toxins with similar adverse health effects combined to create a hazard index. In this case, the hazard index is only for respiratory risk.s.

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