Despite the two standards — one from before and one from after 2015 — “we always want to have [ozone pollution levels] under 70,” he said. “That’s what we’ve set and that’s what we’ll continue to strive for.”

Just because Wyoming exceeded a limit doesn’t mean the EPA will swoop in, take over programs and impose restrictions on activities, Guille said.

“We’re the ones with primacy with air quality and [the] airshed. There’s a process — we’ll work with EPA.”

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A lot of states have areas that are in non-attainment status and haven’t lost primacy, also known as home-rule enforcement of federal standards.

“Our state was a leader and has been a leader on air emissions on minor sources,” Guille said. “We have probably the most stringent standards across the country.”

Nevertheless, “this area is a challenge,” he said. “We’ve been able to reduce emissions a lot. Obviously, it’s not done and we have a lot more to do.”