Credit: NASA/SCIENCE PHOTO LIBRARY

Caption: Air quality in the United States. Map of the United States showing changes in average atmospheric nitrogen dioxide (NO2) concentrations between 2005 and 2014, followed by a trend map of decreases in NO2 concentration. Nitrogen dioxide gas is a common emission from vehicles, power plants and industry, and is used as an indicator of general air quality. The decreases are a result of emission control regulations. Data obtained by the Ozone Monitoring Instrument aboard NASA's Aura satellite.

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Air quality in the USA, 2005

K005/6187 Royalty Free

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Duration: 00:00:15

Frame size: 1920x1080

Frame rate: 25

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Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 462.0M

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Frame size: 3840x2160

Codec: JPEG

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