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

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−	If you need help about filling in a variable, press the Preview button and open the link at the end of this paragraph in a new window. Otherwise, just delete this paragraph and start writing. [[Help:Variable]]	+	{{variable}}
−	'''Scope'''<br>	+	== Scope ==
−	* spatial limits: Helsinki metropolitan area
−	* temporal: year 2020
−	* type of pollutant: PM2.5
−	* source of pollutant: bus traffic
−	== Definition ==	+	*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:
−	List of parents:	+
−	* PM2.5 emissions from bus traffic	+	*[[Variable:PM2.5 emissions from bus traffic|Variable:PM2.5 emissions from bus traffic]]
		+
		+	=== Data  ===
−	=== Data ===
	List of data files or sources:		List of data files or sources:
−	* Database from EXPOLIS study (1996-1997)
−	* Database from ULTRA study
−	=== Formula ===	+	*Database from EXPOLIS study (1996-1997) - individual measurements of total outdoor PM exposure
−	Analytica_id:	+	*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.
		+
		+	'''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  ===
		+
		+	μg/m<sup>3</sup>
−	<anacode></anacode>	+	== Result  ==
−	=== Unit ===	+	[[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]]
−	== Result ==	+	[[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:

• 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.

E_bus = (E_c-E_lrt)/f_tr*f_bus

fi = (Em_i * wf_i)/Sum(Em_i*wf_i)

Where:

E_bus is average PM2.5 exposure to primary particles from local buses (μg/m³)
E_c is total exposure to combustion originating particles (μg/m³)
E_lrt is the concentration of combustion-based long-range transport (average exposure to long-range transported PM2.5)(μg/m³)
f_tr is the ratio of local road traffic exposure to local CoPM (no units)
f_bus is the ratio of local bus-derived primary CoPM to all local road-traffic-derived CoPM (no units)
Em_i is the CoPM emissions in the Helsinki area (%)
wf_i 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