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What for the following abbreviation stand?
CFC, PCB, HC, PAN, BOD, dB, ppm.

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CFC-Chlorofluorocarbon, PCB-Polychlorinated biphenyl, HC-Hydrocarbon, PAN-Peroxyacyl nitrate, BOD - Biological Oxygen Demand, dB -Decibel, ppm - parts per million

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