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Air quality improves in the US
Something major has changed for millions of Americans over the last decade, and many of us don't even know it.
New satellite pictures from NASA show that the air in the United States has improved.
Over the last decade, nitrogen dioxide has decreased in cities across the US.
A NASA atmospheric scientist says the air is getting better, even though the number of cars on the road has increased.
Bryan Duncan, NASA Atmospheric Scientist explains, "our pollutant levels are going down, and that's because cars are becoming more fuel-efficient".
There are more than 140-million Americans who still live in areas that have unhealthy air.
The worst place in the country for ozone pollution is Los Angeles, even though that city has cut its pollution by about a third over the past 15 years.