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The Trump administration says it will allow sales of gasoline with 15% ethanol in it year-round, and it says that will give customers more choices at the pump.

Former administrations banned its sale during the summer, says David DeGennaro of the National Wildlife Federation.

"And that's because ethanol in gasoline actually increases the amount of smog relative to gasoline with no ethanol in it," says DeGennnaro.

Detroit industry
Don...The UpNorth Memories Guy... Harrison... / FLICKR - http://bit.ly/1xMszCg

The EPA has handed down a clear message to Michigan: your air is not clear. The agency says too many people are living in areas with unacceptable smog levels, and it is giving the state three years to come up with a plan to clean up the air.

Air pollution around a highway in downtown Los Angeles
Ali Azimi / Creative Commons

Ozone way up in the atmosphere... good. Ozone near the ground... bad. 

SEMCOG (Southeast Michigan Council of Governments) says the air outside could be unhealthy today.  The group says "elements have been in place for a few days now – sunny skies, hot temperatures, and southerly winds. Admittedly this is beautiful weather, but the ongoing nature of these conditions is compromising our air quality and enabling ground-level ozone to remain high."