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.

Inhalation exposure

The calculation for inhalation exposure is:

E_{air - inhal} = \frac{1}{BW} \cdot F_{a} \cdot [c_{in, a} \cdot t_{in} + c_{out, a} \cdot (1 - t_{in})]

Parameters used in the equation

$E_{air - inhal}$ : average daily external exposure of an individual to substances by air inhalation (default in $μ g / k g b w / d a y$ )

$BW$ : body weight of the individual (default in $k g$ )

$F_{a}$ : daily ventilatory flow ( $m^{3} / d a y$ )

$t_{in}$ : fraction of daily time spend indoors

$c_{in, a}$ : substance concentration in indoor air (default in $μ g / m^{3}$ )

$c_{out, a}$ : substance concentration in outdoor air (default in $μ g / m^{3}$ )