FLAGSTAFF, Ariz. (AP) — Among the hundreds of firefighters, aircraft and engines dispatched to a northern Arizona wildfire were two women whose focus wasn’t on flames, but smoke.

Carolyn Kelly and Anita Thompson are part of a growing program that dispatches specialists to monitor smoke from wildfires.

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Congress earlier this year said all top-tier federal teams battling wildland blazes should have at least one air resource adviser.

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The specialists look at smoke models, humidity, weather patterns and fire behavior to gauge the air quality. They then produce a color-coded smoke forecast that tells the public whether it’s OK to be outside.

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The U.S. Forest Service oversees the program. It has about 95 air resource advisers from various agencies but can’t always fill the requests to send them to wildfires.