Draft Final Conformity Determination

TIP cover 2014


The draft final version of the NYMTC Transportation Conformity Determination for the 2014-2018 Transportation Improvement Program (TIP) and the 2014-2040 Regional Transportation Plan, as amended, is posted for adoption by PFAC on December 4, 2014. This Conformity Determination contains a new regional mobile source emissions analysis, which is required under the Clean Air Act Amendment of 1990 when the TIP and/or Plan are to be amended. 

pdf icon For PFAC Adoption NYMTC Conformity Determination
pdf icon Appendix 1E Monthly PM 2.5 NOx_Emissions
pdf icon OCTC Draft 2014 PM2 5 Conformity Determination
pdf icon NYMTC Transportation Conformity Dashboard


Approved Conformity Determination for
2014-2018 TIP and Plan 2040

Conformity cover 2014


This NYMTC Transportation Conformity Determination for the 2014-2018 Transportation Improvement Program (TIP) and the Plan 2040 (Plan) contains a regional mobile source emissions analysis that reflects compliance of the TIP and Plan with the mobile source emissions requirements under the Clean Air Act of 1990 and the New York State SIP for designated non-attainment areas. The determination was conducted with the United States Environmental Protection Agency’s Motor Vehicle Emission Simulator, and the transportation conformity determination was approved by USDOT on September 30, 2013.

pdf icon NYMTC Approved Conformity Determination
pdf icon Appendix 1G Monthly PM2.5 Numbers
pdf icon PONA Conformity Determination  
pdf icon OCTC PM2.5 Conformity Determination

About Transportation Conformity

MTA hybrid-electric bus uses clean fuel and is helping reduce emissions in the region

Transportation conformity is the process established by USDOT and USEPA to ensure that transportation investments will contribute to improving air quality in areas where pollutants exceed National Ambient Air Quality Standards (NAAQS). The areas are known as non-attainment areas and are designated by USEPA.  All states with non-attainment areas must produce a State Implementation Plan (SIP)  for the attainment of NAAQS within their state. Every MPO TIP and RTP must show compliance with the motor vehicle emissions budgets defined in the SIP.

NYMTC’s  Conformity Determination Process through it’s regional emission analysis, demonstrates how the regional transportation plan and transportation improvement program contributes to meeting targeted reductions of mobile sources of air pollution for the attainment of National Ambient Air Quality Standards. The regional emission analysis focuses on three important sources of air pollution, ground-level ozone, carbon monoxide and particulate matter. The Conformity Determination shows how NYMTC is meeting targeted reduction of the precursors of ozone, NOX and VOC’s, required by the motor vehicle emissions budgets defined in the New York State Implementation Plan for air quality. It also indicates that regional concentrations of carbon monoxide are below required maintenance levels.
DSNY now operates about 800 alternative fuel vehicles, including some that use compressed natural gas (CNG) as well as a sizeable fleet of E85 flexible fuel vehicles.

Smog or ground-level ozone is formed when vehicles emit nitrogen oxides (NOX) and volatile organic compounds (VOC’s) in the presence of sunlight. Since the chemical reactions that create ground-level ozone work best during warm weather this problem is most pronounced during the summer and the analysis is performed during peak season to measure the worst case scenario.

Carbon monoxide is produced by the incomplete burning of carbon in fuels, including gasoline. High concentrations of carbon monoxide occur along roadsides in heavy traffic, particularly at major intersections and in enclosed spaces, such as garages. Peak concentrations of carbon monoxide typically occur during the winter months and the analysis is performed during this peak to measure the worst case scenario.

Soot, technically known as particulate matter or “PM” is typically generated by diesel engines or by unregulated combustion. Fine Particle matter, also known as PM2.5, is a mixture of microscopic solids and liquid droplet suspended in the air, where the size of the particles are less than 2.5 micrometers, or about one-thirtieth the diameter of a human hair. PM2.5 can be emitted directly into the air, from smoke from fires or as a component of automobile exhaust. It can also be formed in the air itself, from industrial and mobile source emission of gases, such as sulfur dioxide and nitrogen oxides.