Monitoring Air Quality at Boston Logan
Air emissions at Boston Logan are measured using a computer modeling system. The FAA’s Emissions and Dispersion Modeling System (EDMS) is used in accordance with FAA requirements for airport air quality analyses; it is also the U.S. EPA preferred model. The FAA continually improves the performance, precision and adaptability of the EDMS and the model is subject to regular updates and revisions.
Alternative Fuel Making a Difference
Emissions from ground service equipment at Logan continue to decline. Estimates are based on EDMS emission factors and the reduction shows progress as a result of Massport’s Alternative Fuel Vehicle Program and the conversion of Massport and/or tenant ground service equipment and fleet vehicles to compressed natural gas (CNG) or electricity.
Model input data are based on an on-site ground service equipment time-in-mode survey completed in 2004 and information obtained from the Logan Airport Vehicle Aerodrome Permit Application process regarding ground service equipment fuel use (e.g., gasoline, diesel, CNG, etc.).
Our vehicle emissions factor data are obtained from the most recent version of the EPA’s MOBILE model combined with the Massachusetts Department of Environmental Protection (MassDEP)’s recommended fleet mix data, operating conditions and other Massachusetts-specific input parameters. MOBILE is preferred by the DEP and used throughout Massachusetts to develop motor vehicle emissions budgets.
Emissions associated with Boston Logan fuel storage and handling facilities, the Central Heating and Cooling Plant, and other stationary sources at the airport are based on annual fuel output records and categorized by emission source and fuel type.
The appropriate emission factors obtained from the EPA TANKS model are used for evaporative fuel emissions. The EPA’s Compilation of Air Pollution Emission Factors along with facility-specific data from operating permits are the basis of stationary source emission factors.
Emissions at Boston Logan
Annual emissions inventory results for Boston Logan activities include assessments for volatile organic compounds, carbon monoxide, and oxides of nitrogen and provide a comparison to prior year results. The emissions inventory for Boston Logan is developed using detailed information on flight activity and aircraft fleet mix at the airport.