View source for PM 2.5 concentration indoors from indoor sources in Finland

{{variable|moderator = Virpi Kollanus}}

[[Category: CLAIH]]

== Scope ==

This variable describes the indoor air PM 2.5 concentration in Finland originating from indoor sources, such as environmental tobacco smoke (ETS), cooking and wood stove combustion.

== Definition ==

=== Data ===

 Description of the data used for obtaining the value of the variable
 (e.g. measurement data; mathematical method and its parameters). <br>
 Please include references (preferably using the ''<nowiki><ref></ref></nowiki>'' tags)
 and links to original data, as appropriate.

=== Causality ===

'''Model''' <ref>[http://www.needs-project.org/docs/results/RS1b/NEEDS_Rs1b_D3.7.pdf NEEDS - New Energy Externalities Developments for Sustainability, Deliverable 3.7 "A set of concentration-response function", Integrated Project, Sixth Framework Programme, Project no. 502687.]</ref>

C<sub>indoor sources</sub> = (N<sub>cig</sub>S<sub>cig</sub>)/(a+k)Vt + (S<sub>cook</sub>t<sub>cook</sub>)/(a+k)Vt + (S<sub>wood stove</sub>t<sub>wood stove</sub>)/(a+k)Vt + (S<sub>combustion</sub>t<sub>combustion</sub>)/(a+k)Vt

*C<sub>indoor sources</sub> = PM2.5 concentration in indoors from indoor sources (µg/m<sup>3</sup>)
*N<sub>cig</sub> = number of cigarettes smoked in the time t
*S<sub>cig</sub> = a source strength for cigarettes (µg particles per cigarette)
*V = volume of the room (m<sup>3</sup>)
*a = aeration (h<sup>-1</sup>)
*t = time (h)
*K = average deposition (h<sup>-1</sup>)
*S<sub>cook</sub> = a source strength for cooking (µg/h)
*t<sub>cook</sub> = time of cooking activities (h)
*S<sub>wood stove</sub> = a source strength factor for wood stove (µg/h)
*t<sub>wood stove</sub> = time of wood stove use (h)
*S<sub>combustion</sub> = a source strength factor for other combustion sources (e.g. natural gas, fuel oil) (µg/h)
*t<sub>combustion</sub> = Time of heating with other combustion sources (h)

=== Unit ===

µg/m<sup>3</sup>
=== Formula ===

 Algebra or other explicit methods if possible
 (e.g. [[Analytica]] code between the ''<anacode></anacode>'' delimiters).

== Result ==

 If possible, a numerical expression or distribution.

==See also==

*[[CLAIH assessment]]

==References==

<references/>