1. Missoula Air Quality Conformity Analysis Required by Federal and Montana Clean Air Act – Transportation-specific air quality requirements enacted in Federal Transportation Acts (ISTEA, SAFETY-LU, MAP-21) EPA sets National Ambient Air Quality Standards (NAAQS) for six principle air pollutants (criteria pollutants) – Transportation accounts for four: carbon monoxide (CO), ozone (O 3 ), nitrogen oxide (NO 3 ), particulate matter (PM 2.5, PM 10 ) Montana Ambient Air Quality Standards (MAAQS) also include: sulfur dioxide (SO 2 ), lead (Pb), settleable particulates and visibility Contributing areas found in violation of the NAAQS for any of the criteria pollutants are designated “nonattainment” Contributing areas can be redesignated “maintenance” if subsequent attainment of NAAQS is met

2. Missoula Air Quality Conformity Analysis (cont.) Currently, Missoula is designated “maintenance” for CO and “nonattainment” for PM 10 Metropolitan Planning Organizations (MPOs) must provide a written conformity determination for transportation plans and TIPs involving designated nonattainment or maintenance areas for transportation-related criteria pollutants

3. EPA Office of Transportation and Air Quality Introduction to MOVES

4. What is MOVES? MOtor Vehicle Emission Simulator – State-of-the-art modeling framework – Replaces MOBILE for on-road vehicle emissions – Significant expansion of capabilities compared to MOBILE – Will also eventually include nonroad emissions to replace separate NONROAD model Designed to allow easier incorporation of large amounts of in-use data from a variety of sources – MOBILE structure limited ability to incorporate new emissions data

5. How Is MOVES Different from MOBILE? MOVES Software Structure Is More Flexible MOVES Offers More Output Options MOVES Covers Multiple Scales and Time Periods MOVES Is a Modal Model MOVES Is Also a Greenhouse Gas Model

6. How Do Emissions Differ from MOBILE? Data collected since MOBILE6 released drives differences between MOVES and MOBILE6 National trends – HC and CO emissions similar or lower than MOBILE6.2 – Total NOx emissions higher than MOBILE6.2 – Total PM emissions substantially higher than MOBILE6.2 Local results may vary – Local fleet mix, fuels, activity are important – Temperature drives PM emissions For attainment analysis, relative change in emissions between base year and attainment year is more important than absolute emissions

7. What It Means Higher NOx and PM emissions mean on-road mobile sources have bigger role in attainment – Percent reduction from base year is key to attainment analysis – PM2.5 shows higher overall emissions and higher % reductions effect on attainment demonstrations could be positive – NOx shows higher overall emissions but lower % reduction could be harder to show attainment – Future NOx control measures could have a bigger impact States need to evaluate these impacts and consider their effects on SIP and conformity requirements

8. Types of Input Data Travel Demand Model Outputs by CO and PM10 boundaries – Average Speed Distribution – Hourly vehicle miles traveled (VMT) Fraction Locally Specific Data – Distribution of vehicles by age for each vehicle type – Number of vehicles within each of 13 vehicle types for the base year (2011) – Market shares for the different fuel types used in the region – The composition of different fuels used in the region – Meteorological data representing temperature and humidity on a typical wintertime weekday – Total VMT by the 6 Highway Performance Monitoring System (HPMS) vehicle types in the base year