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Cut in smog level
Source: ENN,Clean Air Watch, Date: , 2009
The survey by Clean Air Watch volunteers is the first comprehensive
snapshot of smog in the United States in 2009. It found that the
national health standard for smog, technically ozone, was breached more
than 2,600 times through August 31 at monitoring stations in 37 states
and the District of Columbia. During the same period last year,
there were more than 5,000 such events, known in the jargon of the
bureaucracy as "exceedences." There were several key factors in the smog drop, according to Frank O'Donnell, president of Clean Air Watch: cooler, wetter weather, less use of coal-burning electric power plants
to run air conditioners, the general decline in the economy, and the
continuing turnover of cars and trucks to new models that meet tougher
clean-air requirements.
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