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| 1999 || April 1 || Policy || Beijing introduces mission standard for pollutants at double idle speed from vehicle with petrol engine, and for smoke at free acceleration from farm vehicles.<ref name="Improving Urban Air Quality in China: Beijing Case Study"/>
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| 2000 || || || Beijing starts publishing daily reports on its air quality.<ref>{{cite journal |last1=Chen |first1=Wei |last2=Wang |first2=Fusheng |last3=Xiao |first3=Guofeng |last4=Wu |first4=Kai |last5=Zhang |first5=Shixuan |title=Air Quality of Beijing and Impacts of the New Ambient Air Quality Standard |doi=10.3390/atmos6081243 |url=https://www.mdpi.com/2073-4433/6/8/1243/pdf |accessdate=}}</ref>
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| 2001 || January 1 || || Beijing introduces emission standard for exhaust emissions from motorcycles and mopeds.<ref name="Improving Urban Air Quality in China: Beijing Case Study"/>
