SLIDE 1
Colorado Long Term Light-Duty Vehicle On-road Emission Trends Gary - - PowerPoint PPT Presentation
Colorado Long Term Light-Duty Vehicle On-road Emission Trends Gary - - PowerPoint PPT Presentation
First Mexico City Remote Sensing Symposium March 27-28, 2014 Colorado Long Term Light-Duty Vehicle On-road Emission Trends Gary A. Bishop and Donald H. Stedman Department of Chemistry and Biochemistry University of Denver, Denver, CO 80208
SLIDE 2
SLIDE 3
History of FEAT Hardware
SLIDE 4
Historical Mexico City Measurements
5 4 3 2 1
Mean %CO
0.20 0.15 0.10 0.05 0.00
Mean %HC (C3)
Mexico City 1991 Mexico City 1994 Monterrey 1995 Mexico City 2006 Schifter et al Denver 2006
Schifter et al., Environ. Monit. Assess (2008) 137:459‐470.
SLIDE 5
Colorado Measurements
- Twenty one data sets from 1989 to 2014 with
more than 389,000 records.
- HC measurements start in 1991 and NO
measurements in 1999
- All but three of the data sets were collected in
the Denver area
- All data and related publications are available at
www.feat.biochem.du.edu
SLIDE 6
Colorado On-Road Mean Emission Trends
120 100 80 60 40 20
Mean gCO/kg
2015 2010 2005 2000 1995 1990
Measurement Year
25 20 15 10 5
Mean gHC or NO/kg
250 200 150 60 45 30 CO HC NO
- 8.9%
- 10.5%
- 8.7%
SLIDE 7
Colorado On-road Fleet Age Trends
10 8 6 4 2
Fleet Age (years)
2010 2005 2000 1995 1990
Measurement Year
SLIDE 8
Colorado 99th Percentile Trends
1000 800 600 400 200
gCO/kg 99
th Percentile
2010 2005 2000 1995 1990
Measurement Year
250 200 150 100 50
gHC or NO/kg 99
th Percentile
CO HC NO
- 4.4%
- 8.8%
- 3.0%
SLIDE 9
Colorado 99th Percentile Emission Fractions
0.5 0.4 0.3 0.2 0.1 0.0
Fraction of Total Emissions
2010 2005 2000 1995 1990
Measurement Year
CO HC NO
SLIDE 10
Colorado 99th Percentile Age Trends
20 15 10 5
Age 99
th Percentile (years)
2010 2005 2000 1995 1990
Measurement Year
CO HC NO
SLIDE 11
Denver 2014 Fleet Fractions
0.08 0.06 0.04 0.02 0.00
Fleet Fraction
1993 2000 2001 2005 2009 2013
Model Year
SLIDE 12
Denver 2014 and 2007 Fleet Age Fractions Comparison
0.08 0.06 0.04 0.02 0.00
Fleet Fraction
25 20 15 10 5
Vehicle Age (years)
2007 Denver Fleet 2014 Denver Fleet
SLIDE 13
Denver 2014 Measured and Modeled Mean Emissions
30 25 20 15 10 5
Mean g/kg
CO HC x 10 NO x 10 NH x 10
Emission Species
2014 Measured Modeled (2007)
28% 11% 31% 15%
3
SLIDE 14
Conclusions
- Mean emissions in Colorado are decreasing at a
faster rate than the 99th Percentile emissions.
- Emission distributions for all species are
increasing in skewness with the 99th percentile for CO and HC accounting for ~30% of the total.
- The age of the 99th percentile fleet continues to
increase for CO and NO
- The 2009-2010 recessions has resulted in the