Difference between revisions of "PM2.5 concentration from bus traffic in Helsinki in 2020"
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− | == | + | == Scope == |
+ | *Spatial limits: Helsinki metropolitan area | ||
+ | *Temporal limits: year 2020 | ||
+ | *Type of pollutant: primary PM2.5 | ||
+ | *Source of pollutant: bus traffic | ||
+ | == Definition == | ||
− | === Causality === | + | === Causality === |
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− | + | List of parents: | |
− | List of | ||
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− | === Formula === | + | *[[Variable:PM2.5 emissions from bus traffic|Variable:PM2.5 emissions from bus traffic]] |
+ | |||
+ | === Data === | ||
+ | |||
+ | List of data files or sources: | ||
+ | |||
+ | *Database from EXPOLIS study (1996-1997) - individual measurements of total outdoor PM exposure | ||
+ | *Database from ULTRA study - fixed monitoring sites | ||
+ | |||
+ | === Formula === | ||
Total PM2.5 exposure/concentration was used as the starting point for the calculations of PM2.5 due to bus traffic, subtracting the contributions from other sources. | Total PM2.5 exposure/concentration was used as the starting point for the calculations of PM2.5 due to bus traffic, subtracting the contributions from other sources. | ||
− | E<sub>bus</ | + | '''E<sub>bus</sub> = (E<sub>c</sub>-E<sub>lrt</sub>)/f<sub>tr</sub>*f<sub>bus</sub>''' |
+ | |||
+ | '''fi = (Em<sub>i</sub> * wf<sub>i</sub>)/Sum(Em<sub>i</sub>*wf<sub>i</sub>)''' | ||
+ | |||
+ | <u>Where:</u> | ||
− | + | '''E<sub>bus</sub>''' is average PM2.5 exposure to primary particles from local buses (μg/m<sup>3</sup>) <br> '''E<sub>c</sub>''' is total exposure to combustion originating particles (μg/m<sup>3</sup>) <br> '''E<sub>lrt</sub>''' is the concentration of combustion-based long-range transport (average exposure to long-range transported PM2.5)(μg/m<sup>3</sup>)<br> '''f<sub>tr</sub>''' is the ratio of local road traffic exposure to local CoPM (no units)<br> '''f<sub>bus</sub>''' is the ratio of local bus-derived primary CoPM to all local road-traffic-derived CoPM (no units)<br> '''Em<sub>i</sub>''' is the CoPM emissions in the Helsinki area (%)<br> '''wf<sub>i</sub>''' is the relative weight factors to CoPM-emissions (no units)<br> '''wf''' is an estimate of the the impact of a unit emission on the average population exposure in the area (no units)<br> '''Index i''' denotes different CoPM sources in Helsinki<br> | |
− | + | === Unit === | |
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− | + | μg/m<sup>3</sup> | |
− | + | == Result == | |
− | + | [[Image:Pm2.5 buses result.png|Image:Pm2.5_buses_result.png]]<br> For accessible numerical results, go to [[Media:Gasbus_model_01.ANA|Media:Gasbus model 01.ANA]] | |
− | + | [[Category:Kuopio_Risk_Assessment_Workshop_2008]] [[Category:Pollutant]] [[Category:Emission_source]] | |
+ | [[Category:Helsinki]] |
Latest revision as of 20:56, 17 February 2010
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Scope
- Spatial limits: Helsinki metropolitan area
- Temporal limits: year 2020
- Type of pollutant: primary PM2.5
- Source of pollutant: bus traffic
Definition
Causality
List of parents:
Data
List of data files or sources:
- Database from EXPOLIS study (1996-1997) - individual measurements of total outdoor PM exposure
- Database from ULTRA study - fixed monitoring sites
Formula
Total PM2.5 exposure/concentration was used as the starting point for the calculations of PM2.5 due to bus traffic, subtracting the contributions from other sources.
Ebus = (Ec-Elrt)/ftr*fbus
fi = (Emi * wfi)/Sum(Emi*wfi)
Where:
Ebus is average PM2.5 exposure to primary particles from local buses (μg/m3)
Ec is total exposure to combustion originating particles (μg/m3)
Elrt is the concentration of combustion-based long-range transport (average exposure to long-range transported PM2.5)(μg/m3)
ftr is the ratio of local road traffic exposure to local CoPM (no units)
fbus is the ratio of local bus-derived primary CoPM to all local road-traffic-derived CoPM (no units)
Emi is the CoPM emissions in the Helsinki area (%)
wfi is the relative weight factors to CoPM-emissions (no units)
wf is an estimate of the the impact of a unit emission on the average population exposure in the area (no units)
Index i denotes different CoPM sources in Helsinki
Unit
μg/m3
Result
For accessible numerical results, go to Media:Gasbus model 01.ANA