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| 1998 || || || Beijing begins to publish weekly air quality reports.<ref name="Improving Urban Air Quality in China: Beijing Case Study"/>
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| 2003 || || || Euro-II emission standards are implemented for new vehicles in Beijing.<ref name="Improving Urban Air Quality in China: Beijing Case Study"/>
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| 2008 || || || Beijing holds the Olympic Games, and starts policy to eradicate cockroaches, flies, and mosquitoes in a bid to make the city cleaner and more “civilized.” <ref name="Beijing Urbanizes"/>
