Website: Background & Developments
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NB
WHO Air Quality Guidelines
For certain families of chemicals (dioxins, PCBs, hydrocarbons), first find the CAS registry No. or specific HTTVs in “Useful References”
ppm, mg/m3, µg/m3
First, determine the molar mass: 3 options
on-line: www.ac-reims.fr/datice/math-sciences/doc_peda/massemol/calculmassemol.htm
or gfev.univ-tln.fr/mm-find3.htm
download freeware: defoort.free.fr/molecalc/index_fr.html
Next, convert ppm ==> mg/m3 - µg/m3 and vice versa: 2 options
on-line: http://www.cdc.gov/niosh/docs/2004-101/calc.htm
or www.bu.edu/ehs/ih/chemicalsafety/NIOSH_ppm_calculator.html
