The Story of Ever Diminishing Vehicle Tailpipe Emissions as Observed in the Chicago, Illinois Area

Environmental Science & Technology
Gary A Bishop, Molly J Haugen

Abstract

The University of Denver has collected on-road fuel specific vehicle emissions measurements in the Chicago area since 1989. This nearly 30 year record illustrates the large reductions in light-duty vehicle tailpipe emissions and the remarkable improvements in emissions control durability to maintain low emissions over increasing periods of time. Since 1989 fuel specific carbon monoxide (CO) emissions have been reduced by an order of magnitude and hydrocarbon (HC) emissions by more than a factor of 20. Nitric oxide (NO) emissions have only been collected since 1997 but have seen reductions of 79%. This has increased the skewness of the emissions distribution where the 2016 fleet's 99th percentile contributes ∼3 times more of the 1990 total for CO and HC emissions. There are signs that these reductions may be leveling out as the emissions durability of Tier 2 vehicles in use today has almost eliminated the emissions reduction benefit of fleet turnover. Since 1997, the average age of the Chicago on-road fleet has increased 2 model years and the percentage of passenger vehicles has dropped from 71 to 52% of the fleet. Emissions are now so well controlled that the influence of driving mode has been completely eliminated as a factor ...Continue Reading

References

Jun 8, 2006·Applied Spectroscopy·Daniel A BurgardDonald H Stedman
Jul 5, 2007·Journal of the Air & Waste Management Association·John Bachmann
Apr 30, 2008·Environmental Science & Technology·Gary A Bishop, Donald H Stedman
Sep 5, 2009·Journal of the Air & Waste Management Association·Gary A BishopJohn D Ray
Jul 1, 1994·Environmental Science & Technology·Y ZhangD H Stedman
Aug 7, 2013·Environmental Science & Technology·Brian C McDonaldRobert A Harley
Nov 27, 2014·Environmental Science & Technology·Gary A Bishop, Donald H Stedman
Sep 1, 2015·Environmental Science & Technology·Gary A Bishop, Donald H Stedman
May 4, 2016·Environmental Science & Technology·Gary A BishopOscar Atkinson

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Citations

May 2, 2019·Journal of the Air & Waste Management Association·Gary A Bishop
Mar 29, 2021·Environmental Pollution·Yuhan HuangJohn L Zhou
Apr 10, 2021·Journal of the Air & Waste Management Association·Charles L BlanchardJames J Schwab
May 7, 2021·Environmental Science & Technology·Katelyn A YuRobert A Harley
Jun 20, 2020·The Science of the Total Environment·Yuhan HuangHwai Chyuan Ong
Jun 6, 2018·Environmental Science & Technology·Brian C McDonaldMichael Trainer
Nov 7, 2020·Environmental Science & Technology·Gary A BishopJames M Kemper
Nov 9, 2018·Environmental Science & Technology·Molly J HaugenDaniel K Carder
Jun 26, 2020·Environmental Science & Technology Letters·Stuart K GrangeDavid C Carslaw
Oct 19, 2019·Environmental Science & Technology·Yuche ChenJens Borken-Kleefeld
May 17, 2019·Environmental Science & Technology·Stuart K GrangeDavid C Carslaw

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