Side by side maps of greater Boston area showing avoided mortality and healthcare savings from zero emissions

These maps show the annual number of avoided deaths (left) and the healthcare savings (right) that could be reaped in the counties surrounding Boston if air pollution from burning fossil fuels—particulate matter smaller than 2.5 microns and ground-level ozone—dropped from 2011 levels to zero just in the city alone. Darker colors mean larger savings of lives and dollars.