Credit: NASA/SCIENCE PHOTO LIBRARY

Caption: Air quality trends in South Africa. Map of South Africa showing changes in atmospheric nitrogen dioxide concentrations from 2005 to 2014. Blue indicates a decrease in nitrogen dioxide, and red indicates an increase. Nitrogen dioxide gas is a common emission from vehicles, power plants and industry, and is used as an indicator of general air quality. It can cause respiratory problems, and can transform into ozone, another major respiratory pollutant. Data obtained by the Ozone Monitoring Instrument aboard NASA's Aura satellite.

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Keywords: 10 seconds or greater, 2005, 2014, 21st century, africa, african, air, air pollution, air quality, atmosphere, atmospheric, aura, bar, change, city, color-coded, colour-coded, concentration, earth, earth observation, emissions, emitting, environment, environmental, environmental science, from space, gas, geographical, geography, global, indicator, johannesburg, map, mapping, monitoring, nasa, nitrogen dioxide, no-one, no2, nobody, observation, ozone, ozone monitoring instrument, pollutant, pollution, pretoria, satellite, scale, smog, south africa, south african, trend, urban, variation, zoom

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Air quality in South Africa, 2005-2014

K005/6188 Royalty Free

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