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PMCP was placed at the south official smoking area, o-PDCH was placed at the south unofficial smoking area closest to the atrium, PDCB was placed at the unofficial smoking area located at the south exit of the north wing and PMCH was placed at the north official smoking area.
The tracer released at the unofficial smoking area near the North wing of the building (PDCB) was not seen at the concentrations consistent with the Fall study.
PDCB, released at the unofficial smoking area #2 near the north wing exit, was at low levels (< 5 ppt) for the beginning of the day, started rising slightly at sunset (~1630) reaching a constant low level until approximately 2230 when the concentrations started to rise to very high levels.
It is very interesting that PDCB, PMCH, and o-PDCH interior concentrations are strongly affected by the inversion with all increasing by at least a factor of 10 while the PMCP remained fairly constant throughout the sampling period.
The headline of a July news release from NIEHS inappropriately stated that the chemical 1,4 dichlorobenzene, which the agency said may impair lung function, is found "in many air fresheners." In an interview with the Raleigh, NC, News & Observer and a media advisory issued immediately thereafter, CSPA noted that the chemical, which is more commonly known as para-dichlorobenzene (PDCB), may still be found in some urinal blocks, mothballs and hanging deodorizers.
Para-dichlorobenzene (PDCB) is sometimes added to the blocks.
According to handout issued here on Saturday, the spokesman of the Punjab Education Foundation, stated that, the Professional has selected the NGOs Development Certification Body (PDCB) of the Punjab Education Foundation for the conduction of cluster-based trainings for low-cost private school teachers and administrators in Punjab.
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- PDC Prolog