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New Hampshire Department of Environmental Services
PUBLIC GOVERNMENT BUSINESS A to Z LIST

Air Pollutants of Concern
Greenhouse Gases

Carbon Dioxide (CO2)

Properties
A colorless, odorless, and relatively inert gas.

Sources
The product of respiration, combustion of fossil fuels (especially in automobiles and power plants), and certain industrial processes.

Effects
While CO2 at current concentrations is not directly linked to health effects, its contribution to climate change could have pronounced effects on climate, disease, invasive species infestation, frequency of severe weather (heat, drought, storms, etc.), and exacerbation of the effects of other air and water pollutants.

Description
Further information on CO2 and other greenhouse gases is available on the Climate Change page.

Methane (CH4)

Properties
A colorless, odorless, and highly flammable gas.

Sources
Methane is most commonly known as natural gas used for home heating. Most natural gas comes from underground pockets of gas, recovered by drilling. Methane is also the product of digestion, off-gassing from organic decay, and is very commonly produced by farming activities.

Effects
While methane at current concentrations is not directly linked to health effects, its contribution to climate change could have pronounced effects on climate, disease, invasive species infestation, frequency of severe weather, and exacerbation of the effects of other air and water pollutants.

Description
Further information on methane and other greenhouse gases is available on the Climate Change page.




NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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