Ground-level ozone pollution, a problem in summer in many U.S. cities, may contribute to a previously unrecognized form of indoor air pollution.

Ozone seeps indoors from outdoor air and it also forms indoors from operation of certain increasingly popular electronic "air purifiers," as well as printers, faxes and other office equipment, according to William Nazaroff.
Nazaroff, Hugo Destaillats and colleagues at the Lawrence Berkeley National Laboratory report that ozone can interact with ingredients in household cleaning products and air fresheners to produce a group of secondary air pollutants.

The researchers' tests included a pine-oil cleaner, an orange-based household cleaner and a plug-in air freshener.
Ozone interacted with the products to form secondary air pollutants that included formaldehyde, a known human carcinogen and mucus membrane irritant, according to the study published in the journal Environmental Science & Technology.
   
 

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