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EcoWatch
Jun 20, 2019, 2:25 pm59 ptsAfter four decades of improving air quality, the U.S. has started to take a step backwards, as the number of polluted days has ticked upwards over the last two years, the Associated Press reported. Federal data shows there were 15 percent more days with unhealthy air over the U.S. in 2017 and 2018 than there…
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