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

From Testiwiki
Jump to: navigation, search
m (→‎Formula)
(Added category: 'Helsinki')
 
(10 intermediate revisions by 3 users not shown)
Line 1: Line 1:
−
[[category:variables]][[category:Kuopio Risk Assessment Workshop 2008]]
+
{{variable}}
−
== Scope ==
 
−
* Spatial limits: Helsinki metropolitan area
 
−
* Temporal limits: year 2020
 
−
* Type of pollutant: primary PM2.5
 
−
* Source of pollutant: bus traffic
 
  
−
== Definition ==  
+
== Scope  ==
  
 +
*Spatial limits: Helsinki metropolitan area
 +
*Temporal limits: year 2020
 +
*Type of pollutant: primary PM2.5
 +
*Source of pollutant: bus traffic
  
 +
== Definition  ==
  
−
=== Causality ===  
+
=== Causality ===
−
List of parents:
 
−
* [[Variable:PM2.5 emissions from bus traffic]]
 
  
−
=== Data ===
+
List of parents:  
−
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 ===
+
*[[Variable:PM2.5 emissions from bus traffic|Variable:PM2.5 emissions from bus traffic]]
  
−
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.
+
=== Data  ===
  
−
E<sub>bus</sub> = (E<sub>c</sub>-E<sub>lrt</sub>)/f<sub>tr</sub>*f<sub>bus</sub>
+
List of data files or sources:
  
−
fi = (Em<sub>i</sub> * wf<sub>i</sub>)/Sum(Em<sub>i</sub>*wf<sub>i</sub>)
+
*Database from EXPOLIS study (1996-1997) - individual measurements of total outdoor PM exposure
 +
*Database from ULTRA study - fixed monitoring sites
  
−
<u>Where:</u>
+
=== Formula  ===
  
−
E<sub>bus</sub> is average PM2.5 exposure to primary particles from local buses
+
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>c</sub> is exposure to total exposure to combustion originating particles
 
−
 
 
−
E<sub>lrt</sub> is the concentration of combustion-based long-range transport (average exposure to long-range transported PM2.5)
 
−
 
 
−
f<sub>tr</sub> is the ratio of local road traffic exposure to local CoPM
 
  
−
f<sub>bus</sub> is the ratio of local bus-derived primary CoPM to all local road-traffic-derived CoPM
+
'''E<sub>bus</sub> = (E<sub>c</sub>-E<sub>lrt</sub>)/f<sub>tr</sub>*f<sub>bus</sub>'''
  
−
Em<sub>i</sub> is the CoPM emissions in the Helsinki area (tn/year)
+
'''fi = (Em<sub>i</sub> * wf<sub>i</sub>)/Sum(Em<sub>i</sub>*wf<sub>i</sub>)'''
  
−
wf<sub>i</sub> is the relative weight factors to CoPM-emissions
+
<u>Where:</u>  
  
−
Index i denotes different CoPM sources in Helsinki
+
'''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>
  
−
wf is an estimate of the the impact of a unit emission on the average population exposure in the area
+
=== Unit  ===
  
−
=== Unit ===
+
μg/m<sup>3</sup>
  
−
μg/m<sup>3</sup>
+
== Result  ==
  
−
== 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]]
  
−
Estimation of average bus-related primary PM2.5 in 2020 in Helsinki area
+
[[Category:Kuopio_Risk_Assessment_Workshop_2008]] [[Category:Pollutant]] [[Category:Emission_source]]
 +
[[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

Error creating thumbnail: Unable to save thumbnail to destination

For accessible numerical results, go to Media:Gasbus model 01.ANA
Retrieved from "http://www.opasnet.org/testiwiki/index.php?title=PM2.5_concentration_from_bus_traffic_in_Helsinki_in_2020&oldid=14526"