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View Diary: Huge: SCOTUS upholds EPA efforts to regulate greenhouse gases (131 comments)

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  •  Actually no (0+ / 0-)

    It means any reading over 75 ppb averaged over 1 hour is out of attainment. The averaging time isn't the same for all pollutants -- ozone, eg, is 8 hrs; CO (carbon monoxide) has 1 hr and 8hr limits.

    •  You mean that, if at any point during (0+ / 0-)

      a one-hour period the reading jumps over 75, then that's a violation? Any one-hour period? Or a specific hour? Or does it mean continuously exceeding 75 for more than an hour at any time?

      For if there is a sin against life, it consists perhaps not so much in despairing of life as in hoping for another life and in eluding the implacable grandeur of this life. - Albert Camus

      by Anne Elk on Wed Jan 23, 2013 at 09:47:56 AM PST

      [ Parent ]

      •  It means levels cannot exceed (0+ / 0-)

        the limit as averaged over the time period. You can exceed the limit briefly as long as averaged over the time period the number stays below the limit. The time period is any contiguous time span, so there are no specific times involved.

        •  Got it. Finally. (0+ / 0-)

          For if there is a sin against life, it consists perhaps not so much in despairing of life as in hoping for another life and in eluding the implacable grandeur of this life. - Albert Camus

          by Anne Elk on Wed Jan 23, 2013 at 11:14:29 AM PST

          [ Parent ]

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