See NASA's Dazzling Proof that U.S. Air Quality Has Improved

It's summer in the U.S. — the time of year when the humidity skyrockets, air stagnates, and the air quality deteriorates, especially downwind of the coal-fired power plants and manufacturing plants of the Ohio Valley

During hazy and hot summer days in the big cities along the I-95 corridor, the sky often looks like the visual accompaniment to white noise — with the horizon indistinguishable from the milky sky

Yet air quality has actually been steadily improving over the years, largely thanks to the Clean Air Act, along with a drop in coal use and dramatic changes in vehicle fuel efficiency and emissions. On Thursday, NASA released beautiful images demonstrating that people in major U.S. cities from Los Angeles to New York are breathing less nitrogen oxide, a main component of smog. The data comes from the Ozone Monitoring Instrument aboard the Aura satellite Read more...

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