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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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| 2003 || || || Beijing adopts limits and measurement methods for exhaust smoke under lugdown test from agricultural vehicles, motorcycles and mopeds under steady-state loaded mode, exhaust pollutants from gasoline vehicles
under steady-state loaded mode, and exhaust smoke standard for diesel vehicle under lug-down test.<ref name="Improving Urban Air Quality in China: Beijing Case Study"/>
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| 2003 || April 1 || || Beijing adopts limits and measurement methods for exhaust pollutants from nonroad diesel engines.<ref name="Improving Urban Air Quality in China: Beijing Case Study"/>
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| 2003 || October 1 || || Beijing adopts emission controls and limits for oil-gas from gas stations, emission controls and measurement standard for oil-gas from
fuel depots, and emission controls and measurement standard for oil-gas from
tank trucks.<ref name="Improving Urban Air Quality in China: Beijing Case Study"/>
