Cold Facts of Air Pollution

The difference between a breath of cold air and a breath of warm air isn’t just the temperature. It’s also the pollutants they might contain. Until now, wintertime air pollution hasn’t been studied in much detail. Scientists have focused more on warm air, partly because summertime's stagnant atmospheric conditions and intense sunshine tend to worsen ozone pollution. But that's about to change as researchers turn their attention to winter air quality in the eastern United States.