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Updated: Aug. 12 1:30 p.m. A heat advisory for this area has been extended until 8 p.m. Friday, the National Weather Service said this afternoon.

Heat index values of about 102 on Thursday and about 100 on Friday are expected, with the highest heat index values in the late afternoon into early evening each day.

An air quality health advisory is in effect for the Long Island and NYC regions Thursday and Friday from 11 a.m. to 11 p.m., the State Department of Environmental Conservation said.

The pollutant of concern is ozone, the DEC said.

The state issues air quality health advisories when DEC meteorologists predict levels of pollution, either ozone or fine particulate matter are expected to exceed an air quality index value of 100. The AQI was created as an easy way to correlate levels of different pollutants to one scale, with a higher AQI value indicating a greater health concern.

Tomorrow’s AQI for the Long Island Region is forecast to reach 115, which is considered unhealthy for sensitive groups, including young children, those who exercise outdoors, those involved in vigorous outdoor work and those who have respiratory disease, such as asthma.

Summer heat can lead to the formation of ground-level ozone, a major component of photochemical smog. Automobile exhaust and out-of-state emission sources are the primary sources of ground-level ozone and are the most serious air pollution problems in the Northeast. This surface pollutant should not be confused with the protective layer of ozone in the upper atmosphere.

The Town of Riverhead has announced the senior center at 60 Shade Tree Lane in Aquebogue will be open as a cooling center Thursday from 9 a.m. to 4:30 p.m.

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Denise is a veteran local reporter, editor, attorney and former Riverhead Town councilwoman. Her work has been recognized with numerous awards, including investigative reporting and writer of the year awards from the N.Y. Press Association. She is a founder, owner and co-publisher of this website.Email Denise.