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View Diary: Thomas Friedman calls for noise on Keystone XL (44 comments)

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  •  UNEP Differs (0+ / 0-)
    Methane, a potent greenhouse gas, is also one of the most important precursors of tropospheric ozone and thus contributes to air pollution.
    Source [pdf alert]:  http://www.unep.org/...

    Solar is civil defense. Video of my small scale solar experiments at solarray.

    by gmoke on Sun Mar 10, 2013 at 03:00:04 PM PDT

    [ Parent ]

    •  Methane isn't considered a significant contributor (0+ / 0-)

      to our prevailing ozone problems in the United States and methane has not been regulated for ozone control purposes  in ozone control programs and in state implementation plans for ozone control in the United States under the Clean Air Act since methane (and ethane) are explicitly excluded from the definition of volatile organic compound emissions.  

      See 40 CFR Part 51.100(s)(1) at

      http://www.gpo.gov/...

      Note that EPA's view is right in the text of the definition.....EPA indicates the methane and ethane are considered to have negligible photochemical reactivity.

      Methane emissions are not worth worrying about when considering the matter of photochemical oxidants and ozone, which are problems overwhelmingly driven by different pollutants as defined by EPA as ozone precursors -- volatile organic compounds and nitrogen oxides.

      •  UNEP Is Not Concentrating on the US (0+ / 0-)

        The report concentrates on the developing world.  In particular, South Asia where it says the most beneficial effects can occur.

        Methane leaks in the US are numerous, whether they contribute to ozone or not, as a recent Boston University study found (http://www.bu.edu/...).

        Solar is civil defense. Video of my small scale solar experiments at solarray.

        by gmoke on Sun Mar 10, 2013 at 08:01:01 PM PDT

        [ Parent ]

        •  non-methane hydrocarbons as VOCs will always be (0+ / 0-)

          much more important for photochemical oxidant formation than methane everywhere in the world because the photochemical reactivity of methane vs. non-methane hydrocarbons isn't dependent on location and is a property of the individual compounds inherent in the chemical structure of those compounds.

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