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Table 4-46: Estimated National Emissions of Nitrogen Oxides (Million short tons)

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 19701975198019851990199119921993199419951996199719981999200020012002200320042005200620072008200920102011(R) 2012(R) 2013(R) 201420152016
TOTAL26.8826.3827.0825.7625.5325.1825.2625.3625.3524.9624.7924.7024.3522.8422.6021.5523.9622.6521.3320.3519.2318.1016.9115.7714.8514.5213.9013.2812.6011.6210.49
Highway vehicles12.6212.0611.4910.939.599.459.319.169.028.888.738.798.628.378.397.7710.349.679.008.347.997.656.946.215.705.875.475.074.674.143.61
Off-Highway2.652.973.353.583.783.853.923.984.054.114.184.184.164.084.174.164.864.674.474.273.903.523.483.393.323.082.992.892.802.612.42
Fuel combustion10.0610.4911.3210.0510.8910.7810.9311.1111.0210.8310.5110.5510.389.208.828.457.497.056.606.345.955.565.134.754.333.903.753.593.443.182.78
Industrial processesa0.780.540.560.800.800.720.760.740.770.770.800.840.850.780.810.850.950.960.980.980.990.991.001.061.121.181.221.251.291.291.29
Waste disposal and recycling0.440.160.110.090.090.100.100.120.110.100.150.160.160.160.130.130.110.120.130.150.130.110.100.090.090.080.090.100.110.110.11
Miscellaneous0.330.170.250.310.370.290.260.240.390.270.410.190.180.250.280.180.210.180.150.270.270.260.260.280.290.400.390.370.290.290.29

KEY: R = revised.

aIndustrial processes consists of chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; and solvent utilization, storage, and transport.

NOTE

Details may not add up to totals due to rounding in the source.

SOURCE

U.S. Environmental Protection Agency, Air Emissions Inventories, Air Pollutant Emissions Trends Data, available at https://www.epa.gov/air-emissions-inventories/air-pollutant-emissions-tr... as of Mar. 3, 2017.

Updated: Tuesday, May 23, 2017