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2. A running 8 hour mean is a mean which is calculated on an hourly basis, yielding one running 8 hour mean per hour. The running 8 hour mean for a substance at a particular location for a particular hour is the mean of the hourly means for that substance at that location for that hour and the preceding 7 hours.
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Original (As Enacted or Made) - English: The original English language version of the legislation as it stood when it was enacted or made. No changes have been applied to the text.
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