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

Scope
Mass PM2.5 emissions from the bus fleet per year in Helsinki Metropolitan Area (HMA). The variable describes

Definition

Causality

List of parents:

• Emission factors
• Bus traffic intensity (number of bus trips? km travelled?)
• Travelling velocity
• Temperature (other weather factors? - would this be a weather variable, a temperature variable, or not a variable?)
• Engine type
• Fuel type

---

From paper model

• Bus km travelled
• Bus activity
• Relative emission factors

Data

List of data files or sources:

Formula

Analytica_id:

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

Unit

Kg/year