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This is Scientific American 60-Second Science. I'm Christopher Intagliata.

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You may have noticed your summertime electricity bills, when you're cranking the A¨CC, are more pricey than your wintertime payments.

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That's because air-conditioning is an electricity hog.

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And when a whole city or region turns down the thermostat, utilities have to meet that increased demand somehow.

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"This is often when we turn on the oldest plants or the dirtier power plants."

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Tracey Holloway, an atmospheric scientist at the University of Wisconsin in Madison.

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"Some of these older power plants that may run on fuel oil or may run on coal only come on the hottest days."

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Using data from the EPA, Holloway and her team studied how air pollutants respond when the temperature goes up.

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They found that across the eastern U.S., for every degree Celsius temperature rise, power plants belched out 140,000 metric tons of additional carbon dioxide.

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And emissions of the pollutants sulfur dioxide and nitrogen oxides rose three and a half percent per extra degree of heat, averaged across the region.

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That's especially bad, because hot summer days are the worst days to pump out more pollution.

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"These hot days, when we turn on the air conditioning across the U.S.or the state also happen to be the most chemically reactive days.

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So every unit of air pollution going into the air is that much more likely to form ozone."

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And ozone itself is a potent air pollutant.

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The study is in the journal Environmental Science and Technology.

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Holloway says the answer to this summertime pollution peak may be an energy source that thrives on hot, sunny days.

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"If we could be getting solar electricity during this peak time it may offset this hot weather midday peak and be a great solution for avoiding having to turn on those peaking power plants."

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In other words: why not use the sun, to keep cool.

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Thanks for listening, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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