Difference between revisions of "PM2.5 concentration from bus traffic in Helsinki in 2020"

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[[category:variables]][[category:Kuopio Risk Assessment Workshop 2008]]
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{{variable}}
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== Scope ==
 
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* Spatial limits: Helsinki metropolitan area
 
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* Temporal limits: year 2020
 
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* Type of pollutant: primary PM2.5
 
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* Source of pollutant: bus traffic
 
  
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== Definition ==  
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== Scope  ==
  
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*Spatial limits: Helsinki metropolitan area
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*Temporal limits: year 2020
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*Type of pollutant: primary PM2.5
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*Source of pollutant: bus traffic
  
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== Definition  ==
  
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=== Causality ===  
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=== Causality ===
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List of parents:
 
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* [[Variable:PM2.5 emissions from bus traffic]]
 
  
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=== Data ===
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List of parents:  
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List of data files or sources:
 
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* Database from EXPOLIS study (1996-1997) - individual measurements of total outdoor PM exposure
 
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* Database from ULTRA study - fixed monitoring sites
 
  
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=== Formula ===  
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*[[Variable:PM2.5 emissions from bus traffic|Variable:PM2.5 emissions from bus traffic]]
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=== Data  ===
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List of data files or sources:
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*Database from EXPOLIS study (1996-1997) - individual measurements of total outdoor PM exposure
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*Database from ULTRA study - fixed monitoring sites
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=== 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.  
  
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E(bus) = (Ec-Elrt)/f(tr)*f(bus)
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'''E<sub>bus</sub> = (E<sub>c</sub>-E<sub>lrt</sub>)/f<sub>tr</sub>*f<sub>bus</sub>'''
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'''fi = (Em<sub>i</sub> * wf<sub>i</sub>)/Sum(Em<sub>i</sub>*wf<sub>i</sub>)'''
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<u>Where:</u>
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'''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>
  
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fi = (Emi * wfi)/Sum(Emi*wfi)
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=== Unit  ===
  
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=== Unit ===
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μg/m<sup>3</sup>
  
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μg/m<sup>3</sup>
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== Result  ==
  
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== Result ==
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[[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]]
  
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Estimation of average bus-related primary PM2.5 in 2020 in Helsinki area
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[[Category:Kuopio_Risk_Assessment_Workshop_2008]] [[Category:Pollutant]] [[Category:Emission_source]]
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[[Category:Helsinki]]

Latest revision as of 20:56, 17 February 2010


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

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For accessible numerical results, go to Media:Gasbus model 01.ANA
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