ef_europe_emep {gtfs2emis}R Documentation

Speed-dependent emission factor from the European Environment Agency (EMEP/EEA) model

Description

Returns a list or data.table of emission factors for buses based on EMEP/EEA air pollutant emission inventory guidebooks. The function uses four emission factor databases published by EMEP/EEA, considering the editions of 2019, 2016, 2013 and 2007. Estimates are expressed in units 'g/km'. See more in @details.

Usage

ef_europe_emep(
  speed,
  veh_type,
  euro,
  pollutant,
  fuel = "D",
  tech = "SCR",
  slope = 0,
  load = 0.5,
  fcorr = 1,
  as_list = TRUE
)

Arguments

speed

units; Speed in 'km/h'.

veh_type

character; Bus type, classified in "Ubus Midi <=15 t","Ubus Std 15 - 18 t","Ubus Artic >18 t", "Coaches Std <=18 t","Coaches Artic >18 t".

euro

character; Euro period of vehicle, classified in "Conventional", "I", "II", "III", "IV", "V", "VI", and "EEV".

pollutant

character; Pollutant, classified in "FC","CO2","CO","NOx","VOC","PM10","EC","CH4","NH3","N2O". "FC" means Fuel Consumption.

fuel

character; Fuel type, classified in "D" (Diesel),"DHD" (Diesel Hybrid ~ Diesel), "DHE" (Diesel Hybrid ~ Electricity), "CNG" (Compressed Natural Gas), "BD" (Biodiesel).

tech

character; After treatment technology, classified in "SCR" (Selective Catalytic Reduction), "EGR" (Exhaust Gas Recirculation), and "DPF+SCR" (Diesel Particulate Filter + SCR, for Euro VI). Default is "SCR" for "IV" and "V". There are no available after treatment technology associated with euro standards "Conventional", "I", "II" and "III".

slope

numeric; Slope gradient, classified in -0.06, -0.04, -0.02, 0.00, 0.02, 0.04 and 0.06. Negative gradients means downhills and positive uphills. Default is 0.0.

load

numeric; Load ratio, classified in 0.0, 0.5 and 1.0. Default is 0.5.

fcorr

numeric; Correction based on fuel composition. The length must be one per each euro standards. Default is 1.0.

as_list

logical; Returns emission factors as a list, instead of data.table format. Default is TRUE.

Details

The new convention for vehicles names are translated from the EMEP/EEA report:

vehicle category description
Ubus Midi <=15 t Urban Bus Midi size, Gross Vehicle Weight (GVW) <= 15 tons
Ubus Std 15 - 18 t Urban Bus Standard size, GVW between 15 - 18 tons
Ubus Artic >18 t Urban Bus Articulated size, GVW >= 18 tons
Coaches Std <=18 t Coach (inter-state) Standard size, GVW <= 18 tons
Coaches Artic >18 t Coach (inter-state) Articulated size, GVW > 18 tons

When the information of vehicle technology does not match the existing database, the function display a message mentioning the returned technology. User can either select an existing data for the combining variables (euro, tech, veh_type and pollutant), or accept the assumed change in vehicle technology.

In order to cover more pollutants, vehicle technologies, and fuel consumption data, the function uses four emission factor databases published by EMEP/EEA, considering the editions of 2019, 2016, 2013 and 2007.

The R scripts used to download and pre-process 4 EMEP/EEA editions (2019, 2016, 2013 and 2007) can be accessed in the 'gtfs2emis' GitHub repository at <https://github.com/ipeaGIT/gtfs2emis/blob/master/data-raw/ef_europe_emep_db.R>

EMEP/EEA data and reports can be accessed in the following links:

Value

List. emission factors in units 'g/km' (list or a data.table).

See Also

Other Emission factor model: ef_brazil_cetesb(), ef_scaled_euro(), ef_usa_emfac(), ef_usa_moves()

Examples

ef_europe_emep( speed = units::set_units(1:100,"km/h"),
                veh_type = c("Ubus Midi <=15 t","Ubus Std 15 - 18 t","Ubus Artic >18 t"),
                euro = c("IV","V"),
                fuel = "D",
                pollutant = c("CO","PM10","CH4","NOx"),
                as_list = FALSE)
[Package gtfs2emis version 0.1.0 Index]