Monday brought record highs to Long Island, with another day ahead delivering above-normal temperatures before the arrival of a mid-week cool-down, forecasters say.

Long Island MacArthur Airport reached 91 degrees Monday, surpassing the previous record of 88, set in 1988, the National Weather Service said.

An air quality alert is in effect through 10 p.m. Monday because of elevated pollutant levels, the state Department of Environmental Conservation said, and people were advised to avoid strenuous outdoor activity.

An air quality alert is also in effect for Tuesday from 10 a.m. to 10 p.m.

Sunny skies can be expected Tuesday morning, with highs of around 90 degrees, though that could feel more like the mid-90s, the weather service said. That’s for areas other than the East End and right along the South Shore, where conditions will be a bit cooler, said Joe Pollina, weather service meteorologist in Upton.

Also, the day brings a second chance for a new record high, as the record for Tuesday is 92 degrees, set in 1988, he said.

The Town of Hempstead said it would have 14 “cooling centers” open for residents on Tuesday.

Tuesday afternoon and evening could bring some thunderstorms, accompanying the passage of a cold front, which is to bring Wednesday’s and Thursday’s highs down into the 70s.

There’s potential for some of those storms to become severe, with the threat of damaging winds, the weather service said in a hazardous outlook statement.

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As of Monday afternoon’s update, the forecast was for a 30 percent chance for that precipitation Tuesday afternoon, up to 40 to 50 percent chance for the overnight hours, Pollina said.