Figure 74 - Nitrogen Oxide Emissions by Mode: 1991-2001
Monday, September 10, 2012
Figure 74 - Nitrogen Oxide Emissions by Mode: 1991-2001
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SOURCE: U.S. Environmental Protection Agency (EPA), Office of Air Quality Planning and Standards, National Emissions Inventory, Air Pollutant Emission Trends, available at http://www.epa.gov/ttn/chief/trends/index.html/, as of August 2003.