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NASA: U.S. air quality improving

NASA maps show that over the last decade, levels of the air pollutant nitrogen dioxide has decreased in U.S. cities.

U.S. Environmental Protection Agency

A very good  organization of environmental promotion, and we can more support. I very much agree with the concept of this organization.

Original link: U.S. Environmental Protection Agency

ScienceCasts: Monitoring Air Quality

A global effort to monitor air quality is in the works as the US, Korea, and the European Union prepare to launch geostationary satellites capable of monitoring pollutants and other aerosols.

NASA | Human Fingerprint on Global Air Quality

Using new, high-resolution global satellite maps of air quality indicators, NASA scientists tracked air pollution trends over the last decade in various regions and 195 cities around the globe. The United States, Europe and Japan have improved air quality thanks to emission control regulations, while China, India and the Middle East, with their fast-growing economies and expanding industry, have seen more air pollution.

Scientist Bryan Duncan and his team examined observations made from 2005 to 2014 by the Ozone Monitoring Instrument aboard NASA's Aura satellite. One of the atmospheric gases the instrument detects is nitrogen dioxide, a yellow-brown gas that is a common emission from cars, power plants and industrial activity. Nitrogen dioxide can quickly transform into ground-level ozone, a major respiratory pollutant in urban smog. Nitrogen dioxide hotspots, used as an indicator of general air quality, occur over most major cities in developed and developing nations.