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Studying the effects of ozone on human health in a lab setting

Narrator:       
This is Science Today. Every day, we're exposed to a mixture of air pollutants - ozone, particulate matter and oxides of nitrogen. At the University of California, San Francisco, Dr. John Balmes runs controlled human exposure studies in a laboratory setting, exposing people to pollutants under controlled conditions.

Balmes:          And so we've done a number of studies with adults with asthma, exposing them to ozone, exposing them to different types of particulate matter, exposing them to oxides of nitrogen, and sometimes exposing them to the combination of ozone and an allergen.  

Narrator:        In this controlled environment, Balmes and his team have found that ozone enhances the effects of allergen in causing asthma exacerbations.

Balmes:          So, I hope that the message that there are public health impacts of climate change will help galvanize public support around efforts to control green house gas emissions and control climate change.

Narrator:        For Science Today, I'm Larissa Branin.