1973
DOI: 10.2172/4337329
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Handbook of air pollutant emissions from transportation systems

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“…m Xs = i~l j~l pipjxi4rrm (23) where pi is the probability of having wind speed i, pj is the probability of having wind direction j, and X·. is the concentration level associated 1] with these wind characteristics. The variance of the approximate normal di~tribution is n m va.r Cxs) =l.=Il ·L P·P+(X· .-xs) As discussed previously in this section it has been assumed that the 2 maximum annual eight-hour concentrations will be among 7 eight-hour periods which occur annually satisfying the described conditions.…”
Section: =mentioning
confidence: 99%
“…m Xs = i~l j~l pipjxi4rrm (23) where pi is the probability of having wind speed i, pj is the probability of having wind direction j, and X·. is the concentration level associated 1] with these wind characteristics. The variance of the approximate normal di~tribution is n m va.r Cxs) =l.=Il ·L P·P+(X· .-xs) As discussed previously in this section it has been assumed that the 2 maximum annual eight-hour concentrations will be among 7 eight-hour periods which occur annually satisfying the described conditions.…”
Section: =mentioning
confidence: 99%