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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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| 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"/>|-| 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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| 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"/>
