Mission Statement
  & Core Values

District Information
Staff Directory
General Contacts
Governing Board
News & Press Releases
Office Hours
Valley Air Newsletter
Ag Permits/Conservation
 Management Practices(CMP)

Ag Burning
Dairy Permitting
Smoke Management System
Weed Abatement Burning
File a Complaint
Smoking Vehicles
Wood Burning Status
Air Alerts
Air Quality Info
Daily Forecast
Exceptional Events
Real-Time Air Advisory
 Network (RAAN)

Web-based Archived Air Quality (WAAQ) System
Make a Payment
Small Business Assistance
Requests for Proposals (RFPs)
Abrasive Blasting
Certified Equipment
Compliance Assistance

Dust Control
Fireplaces, Stoves,
 and Heaters

Gasoline Dispensing (GDF)
Hazard Reduction Burning
Notice of Violation (NOV)
Policies/Guidance Documents
Prescribed Burning
Record Keeping Forms
Solvent Degreasing
Source Testing
State Portable Equipment
Title V Operating Permits
Training Schedule
Weed Abatement Burning
Calendar Contest
Activity Kit
Healthy Air Living Schools
Real-Time Air Advisory
 Network (RAAN)

Budget & Financial
Email Lists
Information & Documents
Request A Speaker
Public Records Requests
California Environmental
 Quality Act (CEQA)

Climate Change Action Plan
Demolition Permit Release
Guidelines for General Plans
Indirect Source Review
Emissions/Air Quality Models
Air Quality Mitigation
Air Quality Modeling
Air Toxics
Emission Factor
Emissions Inventory
Make Payments
Application Forms
Air Toxics
Ag Permits/Conservation
 Management Practices(CMP)

Best Available Control
 Technology (BACT)

Best Performance
 Standard (BPS)

Dairy Permitting
Drought Relief Actions
Emission Reduction

General Permitting Info
Oil and Gas Registration
Permit-Exempt Equipment
 Registration (PEER)

Portable Equipment
Public Notification
Small Business Assistance
Title V Operating Permits
Citizens Advisory Committee
Environmental Justice
  Advisory Group

Governing Board
Hearing Board
Special City Selection

Study Agency
Workshops & Hearings
Email Lists
Healthy Air Living
Public Notices
Public Records Release  Request
Receive Permit Notice
Workshops & Hearings
Current Rules
Recent Actions
Rules Main
Rules Under Development
File a Complaint
Healthy Air Living
Upcoming Events
Wood Burning
In-Use Off-Road Diesel / SOON Program

On July 26, 2007, the State of California’s Air Resources Board adopted a regulation to reduce diesel particulate matter (PM) and oxides of nitrogen (NOx) emissions from in-use (existing) off-road heavy-duty diesel vehicles. The regulation applies to self-propelled diesel-fueled vehicles that cannot be registered and licensed to drive on-road. Examples include loaders, crawler tractors, skid steers, backhoes, forklifts, and airport ground support equipment. Vehicles with engines less than 25 horsepower are exempt.

The regulation also includes the Surplus Off-road Opt-in for NOx (SOON) program. Local air districts may opt into the SOON program to reduce NOx emissions beyond what is required by the regulation. If our District chooses to participate, we would make incentive money available for fleets that operate in our district to take additional actions to reduce NOx emissions.

Fleet Survey

In order to evaluate the potential benefits of the SOON program, the District needs your help in determining the number of affected vehicles operating in the Valley. You can help us do this by downloading and completing a survey and mailing (or e-mailing) it back to the District.

Survey Forms

Off-Road Diesel Equipment Survey Forms

ARB Tools and Fact Sheets

  • California Air Resources Board has developed several fact sheets for their In-Use Off-Road Diesel Vehicle Rule. To visit their site and view these fact sheets, click here.
  • Fleet Average Calculators. California Air Resources Board has developed fleet average calculators that allow fleets to experiment with different turnover, repower, and retrofit strategies to understand what the in-use off-road diesel vehicle regulation will require. There is one calculator for large / medium fleets and one for small fleets. Small fleets are municipalities and small businesses with less than or equal to 1,500 horsepower total of affected vehicles. To visit their site and download these calculators, click here.