This story appears in the October 2018 issue of National Geographic magazine. Air pollution kills seven million people a year. Two of the chief contributors are lax vehicle emissions standards and ...

Also, the 2030 Agenda for Sustainable Development, which outlines a road map to achieving sustainable development, environmental protection and prosperity for all, recognizes that air pollution ...

The Air Quality Index, often referred to as AQI, is a federal measure of the amount of air pollution, reported on a six-color spectrum from green (good) to hazardous (maroon). There are five ...