How can we encourage standards for less polluting fuels? Photo by Meena Kadri.

Air quality data compiled by the World Health Organization shows alarming rates of dangerous particles in many cities. Photo by Ekhinos.

Power lines and pollution in northern China. Photo by AdamCohn.

Power lines and pollution in northern China. Photo by AdamCohn.

CO2 and air pollutant emissions can be greatly reduced by improving cities’ transportation systems, but accurately measuring these reductions can be a challenge.

People In Mexico City Losing Their Sense of Smell. Produced by theEMBARQ Network on Vimeo.

People In Mexico City Losing Their Sense of Smell. Produced by theEMBARQ Network on Vimeo.