dosage

in atmospheric chemistry
https://doi.org/10.1351/goldbook.D01837
As applied to an @A00194@ in an exposure chamber, dosage is commonly defined as the concentration of the pollutant times the duration of exposure.
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2185 [Terms] [Paper]