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From clean energy to racial justice, the Carolinas are tackling environmental challenges.

The prevailing wisdom is that U.S. air pollution has been on a steady decline since the 1970s. That’s not exactly the case, a new study in the Proceedings of the National Academy of Sciences reveals.

Starting in 2011, progress on cleaning up air pollution stalled — and in some places, smog levels actually increased. The U.S. saw a 7 percent drop in nitrogen oxides between 2005 to 2009, followed by just a 1.7 percent fall from 2011 to 2015.

The EPA had projected a 30 percent decrease in nitrogen oxides between 2010 and 2016. That’s a big difference. Researchers from the U.S., China, Japan, Canada, and the Netherlands compared surface and satellite measurements of air pollutants to the EPA’s emissions estimates, and they were surprised by the discrepancies, which indicate that the EPA data paints an unrealistically rosy picture of our air quality.

The research is less clear about why smog hasn’t improved much in recent years. It could be that we’re past the point of seeing dramatic change after landmark policy changes like the Clean Air Act took effect. Diesel trucks and industry pollution are likely culprits, too.

What’s cause for more alarm are two factors making it even harder to tackle air pollution: the Trump administration and climate change.

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From clean energy to racial justice, the Carolinas are tackling environmental challenges.

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