Emission factors from California Air Resources Board (EMFAC Model)

Running exhaust emissions factors from EMFAC2017 model. The model generates emission factors (EF) of urban buses in California (United States), considering different pollutants, years of reference, model year, fuel, speed ranges, type of regions, model version, and type of season. Currently, the package supports EFs only for "Statewide" region type, and "Annual" season. Specific data of other regions and seasons can be download at <https://arb.ca.gov/emfac/emissions-inventory>.

ef_usa_emfac_db

Format

A data.table with 79198 rows and 8 variables:

pol

Character; Pollutants: CH4(Methane), CO(Carbon Monoxide), CO2(Carbon Dioxide), N2O(Nitrous Oxide), NOx(Oxides of Nitrogen), PM10(Primary Exhaust PM10 - Total), PM25(Primary Exhaust PM2.5 - Total), SOX(Oxides of Sulfur), TOG(Total Organic Gases), ROG (Reactive Organic Gases)

reference_year

Numeric; Year of reference between 2010 - 2020

fuel

character; Type of fuel: 'D' (Diesel),'G' (Gasoline),'CNG' (Compressed Natural Gas).

model_year

Model year.

speed

Units; Speed in 'km/h'; Emission factor are returned in speed intervals such as "5-10", "10-15", "15-20", "20-25", "25-30", "30-35", "35-40", "40-45", "45-50" "50-55", "55-60", "60-65", "65-70", "70-75", "75-80", "80-85", "85-90", ">90" mph (miles/h)

Source

https://arb.ca.gov/emfac/emissions-inventory

Details

The function returns the data in a data.frame format. The R script used to process the raw EMFAC database can be found in the repository <https://github.com/ipeaGIT/gtfs2emis/blob/master/data-raw/ef_usa_emfac_db.R>.

See also

Other emission factor data: ef_brazil_cetesb_db, ef_europe_emep_db, ef_usa_moves_db