View Full Table | Close Full ViewTable 1.

Estimated pollutant emissions† in the United States (millions of metric tons/yr).

 
Pollutant Year
1980 1985 1990 1995 2000 2005 2009
Carbon monoxide 196 187 159 132 112 103 77
Sulfur dioxide 29 25 25 21 18 17 10
Lead 0.082 0.025 0.006 0.004 0.003 0.002 0.002
Nitrogen oxides 30 29 28 28 24 21 15
Volatile organic compounds 33 30 25 24 19 20 14
Particulate matter (PM)
PM10 7 4 3 3 2 2 1
PM2.5 NA§ NA 2 2 2 1 1
Totals 294 276 240 208 175 162 118
Fires and dust excluded. Adapted from USEPA (2011b).
PM10 and PM2.5 refer to particles with aerodynamic diameters that are equal to 10 μm and 2.5 μm or less, respectively.
§NA, not available.



View Full Table | Close Full ViewTable 2.

Estimated pollutant emissions contribution by source† in 2005 (%).

 
Pollutant Electricity generation Fertilizer & livestock Fires & combustion‡ Industrial processes Misc. Nonroad equipment On-road vehicles Solvent use Waste disposal Road dust
Carbon monoxide 0.8 6.8 2.7 0 25 58.8 0 2.4
Lead 2.3 0 7.9 41.2 0.4 41.9 1.2 5
Sulfur dioxide 72.9 15.5 7.8 0 2.5 1 0 0.2
Ammonia 0.6 83.3 2.2 5.2 0 0.1 7.6 0 0.8
Nitrogen oxides 20.7 0 13.5 6.4 0 22.8 35.5 0 0.8
PM10§ 3.1 0.1 4.4 6.2 27.8 1.4 1 0 1.5 52.5
PM25§ 11.5 0 14 12.1 17 6 3 0.2 6.2 21.5
Volatile organic compounds 0.3 0.3 5.2 10.3 7.5 17.8 25.8 26.6 2.9 0
Adapted from USEPA (2011a).
Includes residential wood burning, fossil fuel combustion and fires.
§PM10 and PM2.5 refer to particles with aerodynamic diameters that are equal to 10 μm and 2.5 μm or less, respectively.



View Full Table | Close Full ViewTable 3.

Major sources of volatile organic carbon in San Joaquin Valley 2004 (CDPR, 2006).

 
Category Emissions
%
Livestock waste (dairy cattle) 9.6
Light- and medium-duty trucks 9.1
Light-duty passenger cars 8.3
Prescribed burning 7.5
Oil And gas production 7.4
Pesticides 6.3
Consumer products 6.2