Sentences with phrase «trapping stagnant air»

Sunbelt cities like Los Angeles, Riverside, Calif., and Houston, with their seemingly endless sunny days, gridlocked urban sprawl and heat - trapping stagnant air masses, contain the highest average concentrations of ozone, according to a 2009 study by University of California, Berkeley scientists.

Not exact matches

The surrounding mountains trap these pollutants, and the stagnant air envelops the region in a perpetual cloud of haze.

The stagnant air caused by heat and humidity tends to trap airborne pollutants, such as car exhaust, which react in the presence of sunlight to form ozone, a main ingredient in smog.

Traffic - related pollution and sunlight can combine to promote the production of ozone — a powerful asthma trigger — and the stagnant, humid air of heat waves traps particulate matter and other pollutants, causing them to hang in the air and become more concentrated.