Tiffanie Be Air Pollution Specialist Nesamani Kalandiyur Air

Tiffanie Be, Air Pollution Specialist Nesamani Kalandiyur, Air Resources Supervisor I May 15, 2020 1

• Federal Clean Air Act (CAA) establishes planning requirements for areas that exceed the health-based National Ambient Air Quality Standards (NAAQS) • 2015 70 ppb 8 -Hour Ozone Standard • 0. 075 to 0. 070 parts per million • 19 areas in CA classified as marginal, serious, severe, or extreme • CAA requires states to submit baseline inventories for all NAAs and VMT offset demonstrations for severe and extreme areas within two years of designation 2

1. Amador County, CA - Marginal 2. Butte County, CA - Marginal 3. Calaveras County, CA - Marginal 4. Imperial County, CA - Marginal 5. Kern County (Eastern Kern), CA - Moderate 6. Los Angeles-San Bernardino Counties (West Mojave Desert), CA - Severe 7. Los Angeles-South Coast Air Basin, CA - Extreme 8. Mariposa County, CA - Marginal 9. Nevada County (Western part), CA - Serious 10. Riverside County (Coachella Valley), CA - Severe 11. Sacramento Metro, CA - Moderate 12. San Diego County, CA - Moderate 13. San Francisco Bay Area, CA - Marginal 14. San Joaquin Valley, CA - Extreme 15. San Luis Obispo (Eastern part), CA - Marginal 16. Sutter Buttes, CA * - Marginal 17. Tuolumne County, CA - Marginal 18. Tuscan Buttes, CA * - Marginal 19. Ventura County, CA - Serious * The Sutter Buttes and Tuscan Buttes non-attainment areas contain no anthropogenic sources and, therefore, no emissions. 3

• Emission Inventory Basics • Overview of the general characteristics • 2017 Baseline Emission Inventory • Overview of the requirements and components • VMT Offset Demonstration • Overview of the methodology 4

• Definition • A comprehensive estimate of air pollutant emissions, by source, for a specific geographic area during a given time period • Uses • • • Identify pollutants of concern and their sources Determine amount, distribution, trends Input to air quality modeling Identify and track control strategies Input to health risk assessment 5

6

• Facility operators report activity, emissions data, temporal data, and other facility information to local air district • Various estimation methodologies available • Continuous emission monitors • Source testing • Fuel consumption • Published emission factors (U. S. EPA AP -42) • Material balance • Engineering judgment 7

• CARB and/or local air districts develop estimation methodologies • Data sources: • County-level activity data from surveys, industry reports, census reports, other government agencies • Emission factors from U. S. EPA (AP-42) or special studies 8

• • On-Road • CARB has developed motor vehicle emissions models since 1970 s (EMFAC) • Data sources: • DMV vehicle registration data • Emission factors based on latest available emission test data • Travel activity (vehicle-miles (VMT) from local transportation planning agencies Off-Road • CARB has developed category-specific models • Each model reflects the unique characteristics (equipment types, activity, emission factors, economics) of the source category 9

10

• The baseline inventory includes the total amount of actual ROG and NOx emissions from all anthropogenic sources in the NAA • Since ozone concentrations tend to be highest during the summer months, the emissions used in the baseline inventory is based on the 2017 summer season 11

• This inventory includes… • Stationary point source emissions submitted by the Districts for the 2017 inventory year • Updates from the 2013 - 2015 Consumer & Commercial Product Survey • EMFAC 2017 • New Off-Road Models 12

13

14

15

Nesamani Kalandiyur, Manager 16

• CAA requires to offset growth in emissions due to growth in VMT or vehicle trips through the implementation of transportation control strategies (TCS) and transportation control measures (TCM) for VOC emissions • Required for Severe or Extreme ozone nonattainment areas • Severe: Coachella, Western Mojave • Extreme: South Coast, San Joaquin Valley 17

Step 1: Calculate baseline year on-road emissions Step 4: Calculate attainment year on-road emissions Step 2: Calculate attainment year emissions with attainment year VMT & baseline year control strategies If emissions in Step 4 > Step 3 No additional TCS or TCM required Step 3: Calculate attainment year emissions with baseline year VMT & baseline year control strategies Additional TCS or TCM required to offset difference in emissions 18

19

20

21

Release baseline inventory and VMT offset demonstration May 2020 Take to board June 2020 Submit to U. S. EPA Aug 3, 2020 22

23