Philadelphia officials say residents of the city's Frankford section can return to their normal routines after a massive fire at an industrial building on Christmas Eve prompted air quality concerns.

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the Philadelphia Department of Public Health sent out a warning for residents Wednesday to stay inside. But after collecting air quality samples, city officials gave the all-clear Thursday ...

A huge 3-alarm fire that burned out-of-control about five hours late Tuesday night into Wednesday caused potential air quality concerns, but the surrounding air has been deemed safe for nearby ...

so those are not safe to use during times of poor air quality. Other recommendations for keeping your home's air clean include avoid using fireplaces, candles, incense, grilling and gasoline ...