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The estimation of emission factors (EFs) is the basis of accurate emission inventory. However, the EFs of air pollutants for motor vehicles vary under different operating conditions, which will cause uncertainty in developing emission inventory. Natural gas (NG), considered as a "cleaner" fuel than gasoline, is increasingly being used to reduce combustion emissions, but the information is scarce about how much emission reduction can be achieved for motor vehicles burning NG (NGVs) under realdoi:10.11575/prism/25877 fatcat:aoo4jcc7qrhj5m2gmilgztfcoq