Clean Air Day

Join SANDAG in taking the pledge to commute for clean air on Wednesday, October 4 for California Clean Air Day!

Clean Air Day is built on the idea that shared experiences unite people to take action and create new habits to improve air quality. Join the millions across the state that pledge each year, and commute by carpool, vanpool, transit, biking, or walking on October 4.  

Eligible pledge participants 18 years and older will be automatically entered into the Clean Air Day sweepstakes for the chance to win a prize!

Why Pledge to Clean the Air? San Diego deserves better…

Promotional Offers Available on Clean Air Day

Ride transit on Free Ride Day

Enjoy a free ride on any fixed transit route (Trolley, bus, or COASTER) on Wednesday, October 4 thanks to MTS and NCTD.

Ride Neighborhood Electric Vehicles (NEVs) for FREE 

Use the Circuit app to hail your free ride on NEVs throughout the region.

  • Downtown San Diego: FRED
  • National City: FRANC
  • Oceanside: g'Oside Shuttle - Free rides on 10/4 only
  • Pacific Beach: The Beach Bug

Shared Mobility

  • BCycle: Unlock a BCycle Day Pass for free with code CLEANAIR23 on October 4
  • Bird: Unlock two free rides with code BIRDCA23 on October 4


  • Commute with Enterprise: Receive a $150 fuel card or rental credit for any new vanpool that forms or pre-registers by Tuesday, October 31.
  • Green Commuter: The first 10 NEW vans that start between Sunday, October 1 and Wednesday, November 15 will receive $150 off rental costs for the first month. 

Clean the Air with Your Employees

Encourage your employees to pledge to commute for clean air. Organizations in the SANDAG Employer Commuter Program are eligible to earn one Diamond Awards point for taking the pledge and another point for hosting an event or activity for Clean Air Day.

Host a Clean Air Day Event

Organizations, local governments, libraries, and schools can make a difference in their communities by hosting an event to promote Clean Air Day. Share your event with us by emailing with the title, date/time, location, and a brief event description.