PHOENIX (AZFamily) — Arizona is set to break one record this weekend that was set back in the 70s, but it’s not for heat or rain. Instead, it’s for air quality.

According to the Arizona Department of Environmental Quality, as of Saturday, the state has gone 58 days without exceeding unhealthy levels of ozone. And that just happens to be the record that was set back in 1979.

Ozone forms when pollution from cars and energy plants mixes with the sunlight. This can cause irritation for people with lung problems.

“It’s rather significant because normally we expect on average about 55 exceedance days per year for ozone. We’re at 21 so far this year, so we’re half of that. We usually see about 15 in July; we saw zero this past July,” said Michael Graves, an air quality meteorologist with the

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