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  One of the world’s leading air pollution labs

Narrator:                    This is Science Today. One of the world's leading air pollution laboratories is located at the University of California, Irvine. The Atmospheric Integrated Research unit, known as AirUCI, houses a 26-foot-long aerosol flow tube in which researchers can simulate smog components. AirUCI director Barbara Finlayson-Pitts says in the lab they've discovered that gases drawn into smog particles actually stay there and do not quickly evaporate as previously thought.

Finlayson-Pitts:          They check in, but they don't check out. What this means is that you're going to get more mass of particles in the air faster than current models predict. This is very important because particles do have these negative health effects and so predicting how we're going to control it really relies on the atmospheric models saying if you start out with this much precursor, you're going to get this much particle and our research is helping to provide that connection.

Narrator:                    Their findings can also change the fundamental way that models treat particle formation in the air and hopefully make those predictions more accurate. For Science Today, I'm Larissa Branin.