Category Archives: Announcements

Don’t Light Tonight Begins November 1st

The Yolo-Solano Air Quality Management District’s annual Don’t Light Tonight program officially begins on November 1st and runs through the end of February.  During this period, the District experiences an increased use of woodstoves and fireplaces which raise the level of particulate pollution.  Common weather conditions cause this increased pollution to become trapped closer to the ground, causing breathing problems for many residents, especially the very young, older adults, and those with respiratory ailments and heart disease.

We encourage all residents to stay informed and not burn on days DLT alerts are issued.  Learn more about the program, including more information on wood smoke and health at  Sign up for alerts at

Read the full press release here.

In Memoriam Mat Ehrhardt, P.E.

YSAQMD is sad to announce the passing of Executive Director and Air Pollution Control Officer, Mat Ehrhardt, P.E.

It is with profound sadness that the Yolo-Solano Air Quality Management District (YSAQMD) announces the passing of Executive Director and Air Pollution Control Officer Mat Ehrhardt, P.E. on June 26, 2022.

Mat held a degree in Mechanical Engineering from California State University of Sacramento, where he was on the Dean’s list (1990-1992) and a member of the Tau Beta Pi Engineering Honor Society.   He came to the District in 1997 as an Associate Air Quality Engineer, earning his Professional Engineering license in Mechanical Engineering in 1997 before promoting to Supervising Air Quality Engineer in 2000 and then Deputy Air Pollution Control Officer in 2002. In 2005, he became the Executive Director of YSAQMD, leading operations for nearly 20 years.

Mat was a strong advocate for clean air, but in a way that made sense for all stakeholders, including the regulated community. Though Yolo-Solano is a medium size district, Mat’s impact on statewide air quality policy issues was undeniable, including serving as President of the California Air Pollution Control Officer’s Association from 2009 to 2010.

District staff extend their deepest condolences to his wife, daughter and family and asks to keep them in your thoughts at this difficult time. 

Read the full announcement here.

In lieu of flowers, donations may be made to First Tee – Greater Sacramento area chapter:

First Tee – Greater Sacramento is a non-profit 501(c)(3) organization that teaches children life skills through purposed golf lessons.

Gasoline Dispensing Facilities Veeder Root ISD Software Advisory

An Advisory has been issued for Gasoline Dispensing Facilities (GDF) that have a Veeder Root monitoring console with In Station Diagnostic (ISD) software. GDFs with ISD software installed are permitted to dispense more than 600,000 gallons of gasoline annually. 

No later than March 31, 2023, complete Option #1 or Option #2. The District recommends that the chosen option is implemented when the facility already has a service contractor on-site for other repairs or regular testing. Failing to complete an option by the deadline may result in

District inspectors will verify current compliance at GDFs during regular inspections, but the
District would appreciate a courtesy notification when a facility corrects this problem. Please send a brief email to with the following information:
• Facility name and address
• Date of repair work
• Specify if software was updated (Option 1) or if ACCEPT HIGH ORVR is ENABLED (Option 2).

Read the entire advisory here.