636707 external_news 1593701555 1593701555 NASA scientist Bryan Duncan, who’s a Georgia Tech alumnus, uses satellites to study air quality. One pollutant in particular that he looks at is nitrogen dioxide, another one that affects people’s health. Once it's emitted, it's only around for a matter of hours, so researchers can see hot spots where it's coming from. "So it's a great indicator of pollution in general," Duncan said. 

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