View source for Primary PM2.5 emissions from bus traffic in Helsinki Metropolitan Area

[[category:Kuopio Risk Assessment Workshop 2008]]
{{variable|moderator=Jouni}}

== Scope ==
Total mass primary PM2.5 emissions from the bus fleet per year in Helsinki Metropolitan Area (HMA)in 2020.

== Definition == 

=== Causality === 
List of parents:
*[[Bus engine technology]]

=== Data === 

List of data files or sources: 

Data tables can be found from the analytica model: [[Image:Gasbus model 01.ANA]]

* Bus activities
** Bus kilometres travelled: 77000000 km (1999) <ref> YTV, Helsinki Metropolitan Area Council. (1999). Vaihtoehtoisten polttoaineiden k‰yttˆmahdollisuudet joukkoliikenteessä pääkaupunkiseudulla [The possibilities to use alternative fuels in public transport in the Helsinki metropolitan area]. Helsinki Metropolitan Area Council Publication Series B 1999:5 (in Finnish)</ref>
** Relative bus activity: trips per day: 1.596 (in 2020, relative to 1999) (used as a constant but no uncertainty considered) <ref>YTV, Helsinki Metropolitan Area Council. (1999). Helsinki Metropolitan Area Transport System Plan PLJ 1998. Helsinki Metropolitan Area Council Publication Series A 1999:4</ref>

* Bus emission factors
** Emission factor: 0.321 g/km (1999) <ref>YTV, Helsinki Metropolitan Area Council. (1999). Vaihtoehtoisten polttoaineiden k‰yttˆmahdollisuudet joukkoliikenteess‰ p‰‰kaupunkiseudulla [The possibilities to use alternative fuels in public transport in the Helsinki metropolitan area]. Helsinki Metropolitan Area Council Publication Series B 1999:5 (in Finnish).</ref>
** Relative emission factors depending to the technology (relative to current fleet) <ref>YTV, Helsinki Metropolitan Area Council. (1999). Vaihtoehtoisten polttoaineiden k‰yttˆmahdollisuudet joukkoliikenteessä pääkaupunkiseudulla [The possibilities to use alternative fuels in public transport in the Helsinki metropolitan area]. Helsinki Metropolitan Area Council Publication Series B 1999:5 (in Finnish)</ref>
** Relative emission factor uncertainty (for diesel with filter and natural gas, based on author judgement)

* Total emission from buses kg/a in 1999 (this relates to all pollutants and is needed to deduce the primary PM <sub>2.5</sub>emission fraction) <ref>YTV, Helsinki Metropolitan Area Council. (1999). Vaihtoehtoisten polttoaineiden k‰yttˆmahdollisuudet joukkoliikenteess‰ p‰‰kaupunkiseudulla [The possibilities to use alternative fuels in public transport in the Helsinki metropolitan area]. Helsinki Metropolitan Area Council Publication Series B 1999:5 (in Finnish).</ref>

=== Formula === 
Analytica_id: 

:Var a:=bus_km*(emission_factor/1000);
:a:=a*Relative_emission_fa;
:a:=a*Relative_emission_f2;
:a*Rel_bus_activity

The complete formula can be found from the analytica model: [[Image:Gasbus model 01.ANA]]

=== Unit === 
Kg/year
== Result ==

* Year: 2020, using 4 different scenarios, defined in 

* [[Gasbus_-_health_impacts_of_Helsinki_bus_traffic]]

{| {{prettytable}}
|
|Min
|Mean
|Max
|Std. Dev.
|0.05
|0.25
|0.5
|0.75
|0.95
|----
|BAU A
|3.95E+04
|3.95E+04
|3.95E+04
|0.01179
|3.95E+04
|3.95E+04
|3.95E+04
|3.95E+04
|3.95E+04
|----
|EURO 3 D3
|1.96E+04
|1.96E+04
|1.96E+04
|0.01235
|1.96E+04
|1.96E+04
|1.96E+04
|1.96E+04
|1.96E+04
|----
|CRT filter C
|6013
|9956
|1.39E+04
|1626
|7233
|8790
|9956
|1.11E+04
|1.27E+04
|----
|Natural gas G31
|4622
|5763
|6904
|470.6
|4975
|5426
|5763
|6101
|6551
|----
|}

{{resultlink|10}}

== References ==
<references/>
[[Category:Helsinki]]