Haze from wildfires in Canada on June 7, 2023, viewed from Doctors Path in Riverhead. RiverheadLOCAL/Peter Blasl

An air quality health advisory has been issued for Nassau and Suffolk counties for Thursday, according to the New York State Department of Environmental Conservation.

The advisory is in effect from 11 a.m. to 11 p.m. Thursday, when outdoor air quality is forecast to be greater than an air quality index value of 100 for ground-level ozone.

When pollution levels are elevated, the New York State Department of Health recommends limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. Those most sensitive to elevated pollution levels include young children and people with preexisting respiratory problems such as asthma or heart disease. Anyone experiencing symptoms should consider consulting a personal physician.

The advisory comes as hot and humid conditions build across the region. The National Weather Service forecast for Riverhead calls for a high near 90 degrees Thursday, with heat index values as high as 96.

More information is available at https://on.ny.gov/nyaqi or by calling the air quality hotline at 1-800-535-1345.

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