immission rate

in atmospheric chemistry
https://doi.org/10.1351/goldbook.I02970
The mass (or other physical quantity) of pollutant transferring per unit time into a receptor.
Source:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2196 (https://doi.org/10.1351/pac199062112167)