Volume 11, Number 7
Oct 1987

Changing PPM into Micrograms/M3

The 1978 edition of Garry Thomson's The Museum Environment tells you on p. 125 how to convert parts per million to micrograms per cubic meter. The formula is in a footnote:

 M 1 ppm= ------ ug/m3 0.0224

where M is the molecular weight of the pollutant gas.