Variables
Description
What is this formula?
This formula estimates the inhaled dose of an indoor air pollutant from its concentration, the inhalation rate, and the exposure duration.
When to use it
Use it for simplified exposure assessment in indoor environments such as homes, schools, offices, hospitals, laboratories, and industrial buildings.
Example
Data:
C = 40 µg/m³
IR = 0.8 m³/h
t = 6 h
Formula:
D = C · IR · t
Substitution:
D = 40 · 0.8 · 6
Result:
D = 192 µg
Applications
Indoor air quality assessment, environmental health studies, risk screening, occupational exposure analysis, HVAC evaluation, and contaminant control planning.
Note
This is a simplified exposure estimate. It assumes constant pollutant concentration, constant inhalation rate, and full exposure during the selected time period. More advanced exposure models may include activity level, age, body weight, filtration, deposition, time-varying concentrations, and toxicological dose-response factors.