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| 1988 || || || Beijing’s municipal government maintains a preventative policy of eradicating the rodents, which would dramatically reduce rat numbers.<ref name="Beijing Urbanizes">{{cite web |title=Beijing Urbanizes, and a Much-Loved Bird Vanishes From the City |url=https://www.sixthtone.com/news/1003954/beijing-urbanizes%2C-and-a-much-loved-bird-vanishes-from-the-city |website=sixthtone.com |accessdate=12 May 2019}}</ref>
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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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| 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"/>
