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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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| 1998 - 1999 || || || Air quality in Beijing improves significantly during and after the Olympics, but most of the effect fades away by the end of October 2009.<ref name="Air Pollution Control Policies in China: A Retrospective and Prospects">{{cite journal |last1=Jin |first1=Yana |last2=Andersson |first2=Henrik |last3=Zhang |first3=Shiqiu |title=Air Pollution Control Policies in China: A Retrospective and Prospects |doi=10.3390/ijerph13121219 |pmid=27941665 |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5201360/ |pmc=5201360}}</ref>
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| 1999 || January 1 || Policy || Beijing introduces emission standard for exhaust pollutants from light-duty vehicles.<ref name="Improving Urban Air Quality in China: Beijing Case Study"/>
