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Table 1 Comparing the GHG emissions of several fossil fuels

From: The role of natural gas as a primary fuel in the near future, including comparisons of acquisition, transmission and waste handling costs of as with competitive alternatives

Pollutant (pounds per billion btu of energy input) Natural gas Oil Coal
Carbon dioxide 117,000 164,000 208,000
Carbon monoxide 40 33 208
Nitrogen oxides 92 448 457
Sulfur dioxide 1 1,122 2,591
Particulates 7 84 2,744
Mercury 0.000 0.007 0.016
  1. Source: EIA - Natural Gas Issues and Trends 1998