Intense Heat in Western U.S. States Worsens Ozone Pollution

June 21, 2021, 8:42 PM

High temperatures across the western U.S. fueled surging ozone pollution levels in states like Texas, California, and Arizona.

Some Texas cities clocked some of the worst ozone pollution of the year last week during the peak of the heat wave, according to data from the Texas Commission on Environmental Quality. Counties in Dallas and Houston, with high temperatures pushing near 100 degrees, crossed the EPA’s threshold for “unhealthy” ozone pollution levels.

“The heat out west certainly seems to be affecting the ozone days out there, and maybe into the Midwest,” said Paul Miller, executive director of the Northeast States for ...

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