(Cleveland) — The frigid winter weather in Ohio is causing an unexpected problem — unhealthy air.

Authorities say the cold, stagnant air is trapping and concentrating pollution in an area stretching from Cleveland to Columbus to Cincinnati. That has led the Northeast Ohio Areawide Coordinating Agency (NOACA) to issue an air quality alert for Greater Cleveland.

That means older people, children and those with breathing disorders should limit strenuous or prolonged outdoor activities.

Light winds, low temperatures and high pressure worked together to force soot particles closer to the ground.

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