Through the help of satellite observations, NASA scientists have released the first-ever study to examine just how much more air pollution people living in large cities are exposed to compared to those living in less populous areas.

Image Credit:  NASA image courtesy Jeff Schmaltz, MODIS Rapid Response Team at NASA GSFC.

NASA scientists have used satellite observations to measure air pollution's dependence on population in four of the planet's major air pollution regions: the United States, Europe, China and India.

Image Credit:  the SeaWiFS Project, NASA/Goddard Space Flight Center, and ORBIMAGE.

A new NASA-led study finds that when it comes to combating global warming caused by emissions of ozone-forming chemicals, location matters.

Image Credit: NASA-JPL/Caltech/CU-Boulder.

A team of scientists have used the Ozone Monitoring Instrument (OMI) on NASA's Aura satellite to confirm major reductions in the levels of a key air pollutant generated by coal power plants in the eastern United States. The pollutant, sulfur dioxide, contributes to the formation of acid rain and can cause serious health problems.

Image Credit: Jesse Allen, NASA Earth Observatory.