On the eve of what appears to be a blistering weekend, the state Department of Environmental Conservation issued an air quality health advisory.
The advisory issued Friday for the New York City metropolitan area comes as temperatures are creeping into the 90s.
The advisory was issued for Friday and Saturday.
Summer heat can form ground-level ozone, a major component of smog, according to the DEC.
Officials recommend that children and anyone with respiratory disease limit strenuous outdoor activity when ozone levels are highest, generally the afternoon to early evening.