Chemical reactions caused by the sun's rays worsen air pollution from idling jets at airports.
In the United States, nearly 50,000 planes fly every day. They open their doors, start their engines and wait. People board, fasten their seatbelts and wait. The planes close their doors, taxi to the runway and wait. All that waiting adds up to a lot of pollution produced by the powerful jet engines as they run at low power without moving, something engineers refer to as idling.
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