An assistant (top) helps as a woman breathes through a mask connected to a plastic bag with air taken in Laojun Mountain of Luanchuan county, during a promotional event on a hazy day in Zhengzhou, ... more 
An assistant (top) helps as a woman breathes through a mask connected to a plastic bag with air taken in Laojun Mountain of Luanchuan county, during a promotional event on a hazy day in Zhengzhou, Henan province, March 29, 2014. According to organizers, the event was held to promote fresh mountain air in the tourist resort and they hope to attract more visitors to the area, local media reported. China's plan for a market in air pollution permits promises to help clean up its air cheaply, but the move could prove just as useless as previous environmental policies unless the government stamps out lax enforcement and spotty data. Picture taken March 29, 2014. REUTERS/Stringer (CHINA - Tags: ENVIRONMENT SOCIETY POLITICS TRAVEL TPX IMAGES OF THE DAY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA less 
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Reuters | Photo By CHINA STRINGER NETWORK / REUTERS
Sun, Mar 30, 2014 11:49 PM EDT