Air exposures calculation details
The long term (chronic) air exposure assessment through inhalation is related to exposure to substances in air. MCRA applies in principle the equations as used in RSExpo.
Air exposures are generated using properties age and sex of a simulated set of individuals or, as an alternative, an existing set of individuals (currently, the dietary individual population, see module dietary exposures). Specify the reference population with option Specify individuals for generating air exposures with settings Simulate individuals or Use dietary individuals.
Inhalation exposure
The calculation for inhalation exposure is:
Parameters used in the equation
\(\mathtt{E_{air-inhal}}\): average daily external exposure of an individual to substances by air inhalation (default in \(\mu g/kg \, bw /day\))
\(\mathtt{BW}\): body weight of the individual (default in \(kg\))
\(\mathtt{F_a}\): daily ventilatory flow (\(m^3/day\))
\(\mathtt{t_{in}}\): fraction of daily time spend indoors
\(\mathtt{c_{in,a}}\): substance concentration in indoor air (default in \(\mu g/m^3\))
\(\mathtt{c_{out,a}}\): substance concentration in outdoor air (default in \(\mu g/m^3\))