After the pigeons are fitted with pollution sensors, they are released into different parts of London. Londoners can then get live air quality readings via Twitter. Rich Preston/NPR hide caption

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Pigeons Are London's Newest Pollution Fighters
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The Speck air quality monitor costs $200, but is available to all through Pittsburgh's public library system. Carnegie Mellon University CREATE Lab hide caption

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A Home Air Quality Monitor That Can Be Checked Out From The Library
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Cooking on gas and electric stoves can create indoor air pollution. The best way to avoid it is to buy a good range hood that vents outside, experts say. iStockphoto.com hide caption

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Fixing Stove Hoods To Keep Pollution Out Of The Kitchen
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