Figure 7-15 Indexes of Key Air Pollutant Emissions from U.S. Transportation: 1990-2014

Thursday, March 31, 2016

Index: 1990 = 1.0

Indices	1990	1991	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014
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	0.72	0.66	0.65	0.62	0.58	0.55
Particulate Matter - PM 10	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	0.71	0.83	0.78	0.73	0.68
Nitrous oxide - NOx	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	0.67	0.67	0.62	0.58	0.54
Volatile organic compounds - VOC	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	0.42	0.39	0.36	0.33
Sulfur dioxide - SO2	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	0.28	0.28	0.18	0.18	0.16	0.14	0.11
Carbon Monoxide	1.00	0.96	0.93	0.89	0.85	0.82	0.78	0.76	0.74	0.70	0.70	0.67	0.56	0.54	0.52	0.49	0.46	0.43	0.39	0.33	0.33	0.32	0.31	0.29	0.28
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	0.73	0.71	0.68	0.65	0.63	0.60

SOURCE: U.S. Environmental Protection Agency, National Emissions Inventory Air Pollutant Emissions Trends Data, 1970-2014, Average Annual Emissions All Criteria Pollutants, Available at http://www.epa.gov/ttn/chief/trends/index.html as of June 2015.

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Figure 7-15 Indexes of Key Air Pollutant Emissions from U.S. Transportation: 1990-2014