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An Air Quality Action Day has been declared for the Susquehanna Valley on Sunday, June 17, the Pennsylvania Department of Environmental Protection announced.

A Code Orange air quality alert was issued by the DEP for Sunday because of a high level of ozone in the air, the DEP said in an email.

A Code Orange means air quality will be unhealthy for sensitive people, including children, people with asthma, heart disease or other conditions affecting breathing, and the elderly.

Ozone levels will be high on Sunday because of high sunshine and low winds, the DEP said. Fine particulates will also increase as relative humidity increases. 

Sunday's forecast for York calls for a high of 89 and low of 71, with lots of sun and calm winds, according to the National Weather Service.

Monday could bring even higher levels of ozone, the DEP said. Monday's forecast calls for sun and a high of 95, with a heat index of 101, the NWS said. Another Air Quality Action Day is expected on Monday.

On Air Quality Action Days, residents are asked to set air conditioners at a higher temperature to conserve energy; refuel vehicles after dusk; reduce driving when possible; and limit use of chemicals in the home and garden.

Tuesday will see a break in the heat as a cold front moves in, bringing thunderstorms and highs in the upper 80s, the NWS said.

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