31 May '18, 2pm

Pollutant Emissions Leveling Off a Bit in the U.S.

The air we breathe today in the United States is much cleaner than it was in the 1960s and 70s. But recent satellite data show that air quality is not improving as quickly as predicted by models. “Air quality is better than it was decades ago, but now we’re starting to see the improvement slow down,” said Helen Worden, atmospheric scientist at the National Center for Atmospheric Research. In a recent study supported by NASA, lead author Zhe Jiang, Worden, and a group of researchers used satellite data and advanced computer simulations to find that major air pollutants are not decreasing as rapidly as expected. That is, air quality is not improving as much as the U.S. Environmental Protection Agency’s (EPA) inventories and computer models indicate they should. The team looked at two major air pollutants: carbon monoxide and nitrogen oxide (NOx). Both are emitted by cars, tr...

Full article: https://earthobservatory.nasa.gov/IOTD/view.php?id=92215&...

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