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FIGURE 8-15 Indexes of Key Air Pollutant Emissions from U.S. Transportation: 1970-2013

Friday, April 10, 2015

Graphic Version | Excel

Index: 1990 = 1.0

Indices 1970 1975 1980 1985 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
Particulate Matter - PM 2.5         1.00 0.98 0.96 0.94 0.91 0.89 0.87 0.84 0.81 0.79 0.75 0.72 1.07 1.03 0.99 0.96 0.90 0.85 0.78 0.73 0.66 0.67 0.63 0.59
Particulate Matter - PM 10 0.90 0.93 0.96 1.00 1.00 0.98 0.96 0.94 0.92 0.90 0.88 0.85 0.82 0.81 0.77 0.74 1.07 1.03 1.00 0.96 0.92 0.89 0.83 0.77 0.72 0.71 0.68 0.65
Nitrous oxide - NOx 1.14 1.12 1.11 1.08 1.00 0.99 0.99 0.98 0.98 0.97 0.97 0.97 0.96 0.93 0.94 0.89 1.14 1.07 1.01 0.94 0.89 0.84 0.78 0.72 0.68 0.67 0.62 0.58
Volatile organic compounds - VOC 1.54 1.44 1.33 1.23 1.00 0.96 0.92 0.88 0.84 0.80 0.76 0.73 0.71 0.69 0.66 0.63 0.59 0.57 0.55 0.52 0.52 0.51 0.46 0.43 0.42 0.38 0.36 0.34
Sulfur dioxide - SO2 0.63 0.73 0.82 0.93 1.00 0.97 0.94 0.91 0.88 0.85 0.82 0.83 0.84 0.89 0.80 0.79 1.16 1.03 0.91 0.78 0.58 0.38 0.27 0.29 0.19 0.14 0.13 0.12
Ammonia - NH3         1.00 1.10 1.17 1.24 1.32 1.39 1.45 1.61 1.56 1.45 1.49 1.51 0.85 0.83 0.82 0.80 0.80 0.80 0.76 0.71 0.66 0.66 0.64 0.62

SOURCE: U.S. Environmental Protection Agency, National Emissions Inventory Air Pollutant Emissions Trends Data, 1970-2013, Average Annual Emissions All Criteria Pollutants, Available at http://www.epa.gov/ttn/chief/trends/index.html as of October 2014.