National Weather Service forecasters are warning of potentially unhealthy air quality in parts of Massachusetts on Tuesday, amid a heat wave blanketing the state.
The Air Quality Advisory issued by the Department of Environmental Protection is not the result of wildfire smoke, as it was last week, but instead ozone. Ground-level ozone is the main ingredient in smog, and is most likely to hit unhealthy levels on hot days in urban areas, according to the Environmental Protection Agency.
The advisory spans 11 a.m. to 11 p.m. on Tuesday in parts of Bristol, Essex, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk and Worcester counties. The air is expected to be unhealthy for sensitive children and adults, like those with asthma, lung or heat disease, and older adults.
Sensitive children and adults should limit prolonged outdoor activity.
The warning from forecasters comes as Massachusetts experiences yet another heat wave, with temperatures exceeding 90 for the second straight day on Tuesday.
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