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Environmental Comparisons

Comparison of typical fossil-fuel-emissions levels

(pounds per billion Btu of energy input)
Emission Component Natural Gas Oil Coal
Carbon Dioxide 117,000 164,000 208,000
Carbon Monoxide 40 33 208
Nitrogen Oxide 92 448 457
Sulfur Dioxide 1 1,122 2,591
Particulates 7 84 2,744
Mercury 0.000 0.007 0.016
 

Typical emissions levels for natural gas-fired generating plants

(pounds per megawatt-hour)
Plant
Configuration: 
Carbon
Dioxide
Carbon Monoxide Nitrogen
Oxides
Sulfur
Oxides
Particulate Matter Mercury
Combined-cycle: 760 0.26 0.60 0.01 0.05 0.00000
Simple-cycle: 1,140 0.39 0.90 0.01 0.07 0.00000
 

Typical emissions levels for coal and fuel-oil-fired generating plants

(pounds per megawatt-hour)
 Plant
Configuration 
Carbon
Dioxide
 Carbon Monoxide Nitrogen
Oxides
Sulfur
Oxides
Particulate Matter Mercury
Coal-fired/ steam: 2,028 2.03 4.45 25.26 26.75 0.00016
Oil-fired/ steam 1,600 0.32 4.37 10.93 0.82 0.00007
 

Comparison of emissions for auto engines

(pounds per million Btu)
 Fuel Type Carbon
Dioxide
 Carbon
Monoxide
 Nitrogen
Oxides
Total Hydrocarbons Particulate
Matter
Natural gas 119.6 0.409 0.082 0.193 NA
Gasoline 160.7 1.215 0.095 0.061 NA
 

Comparison of emissions for heavy-duty truck engines

(pounds per million Btu)
 Fuel Type Carbon
Dioxide
 Carbon
Monoxide
 Nitrogen
Oxides
  Total Hydrocarbons Particulate
Matter
Natural gas 125.6 0.004 0.844 0.893 0.001
Diesel 166.7 0.078 1.443 0.045 0.025
 

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