Fossil fuel combustion produces greenhouse gases that heat the planet, but it also emits air pollutants that harm human health. Fine particulate matter and ozone, for example, have been linked to fatal lung and heart issues. A recent study coauthored by Professor Daven Haze and recent PhD graduate Omar Nawaz adds to the growing body of research that shows that when countries reduce their greenhouse gas emissions, the associated improvements in air quality could save countless lives.