Long-term trends in motor vehicle emissions in u.s. urban areas.

@article{McDonald2013LongtermTI,
  title={Long-term trends in motor vehicle emissions in u.s. urban areas.},
  author={Brian C McDonald and Drew R Gentner and Allen H. Goldstein and Robert A Harley},
  journal={Environmental science & technology},
  year={2013},
  volume={47 17},
  pages={10022-31}
}
A fuel-based approach is used to estimate long-term trends (1990-2010) in carbon monoxide (CO) emissions from motor vehicles. Non-methane hydrocarbons (NMHC) are estimated using ambient NMHC/CO ratios after controlling for nonvehicular sources. Despite increases in fuel use of ∼10-40%, CO running exhaust emissions from on-road vehicles decreased by ∼80-90% in Los Angeles, Houston, and New York City, between 1990 and 2010. The ratio of NMHC/CO was found to be 0.24 ± 0.04 mol C/mol CO over time… CONTINUE READING
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