Jeremy Rocha
Founder and Editor
August 29, 2026
The air in the San Joaquin Valley has long been both a public health challenge and a political battleground. Ozone and fine particulate matter remain stubborn problems. On many days the region still ranks among the most polluted in the nation for these pollutants. Against that backdrop, California’s primary climate program—once called Cap-and-Trade and now rebranded Cap-and-Invest—has become one of the most important sources of money for the equipment upgrades, truck replacements, and community projects that actually reduce emissions on the ground.
In September 2025 the Legislature passed and the governor signed AB 1207 and SB 840. Together the bills extended the program through 2045, renamed it Cap-and-Invest, altered how allowances and offsets work, and restructured how auction revenues flow into the Greenhouse Gas Reduction Fund. For the Valley, the practical question is whether those changes will deliver cleaner air where people live and work or simply shift costs and priorities in ways that leave local needs underfunded.
How the Program Reaches the Valley
Cap-and-Invest sets a declining limit on greenhouse gases from major sources and requires covered entities to hold allowances for their emissions. Many allowances are auctioned. The resulting revenue lands in the Greenhouse Gas Reduction Fund and is then appropriated to a wide range of programs. Some of those programs—especially those that replace old diesel engines—produce measurable reductions in the nitrogen oxides and particulate matter that drive the Valley’s air quality problems.
The San Joaquin Valley Air Pollution Control District has long treated these funds as essential. Programs such as FARMER (Funding Agricultural Replacement Measures for Emission Reductions) pay part of the cost of replacing aging tractors, harvesters, and irrigation engines with cleaner models. Heavy-duty truck replacement programs, zero-emission yard trucks, and community-level projects under AB 617 draw from the same overall pool. In recent budget cycles the district has managed hundreds of millions of dollars in incentive grants, with agricultural equipment and trucks accounting for a large share of the spending.
Demand consistently outstrips supply. By mid-2025 the district reported more than six thousand pending applications for agricultural equipment replacement alone, representing hundreds of millions of dollars in requested funding. When FARMER allocations dropped sharply, the backlog grew and some replacement activity slowed. Local officials have repeatedly told Sacramento that sustained, predictable funding in the range of $200 million a year statewide would be needed to keep the turnover of high-emitting equipment on track.
What Changed in 2025
AB 1207 and SB 840 did more than extend the program’s life. They changed the rules around offsets by requiring that allowances be removed from future budgets when offsets are used, effectively tightening the overall emissions cap. They adjusted free allowance allocations for utilities and industry. Most consequentially for local air districts, SB 840 established a clearer priority order for Greenhouse Gas Reduction Fund spending and created a statutory annual allocation of $250 million for the Community Air Protection Program under AB 617.
That dedicated funding is significant. AB 617 communities in the Valley—neighborhoods selected because of high cumulative pollution burdens—have used earlier rounds of money for everything from residential air filtration to cleaner commercial equipment and truck routing studies. A stable statutory allocation reduces the year-to-year uncertainty that has complicated multi-year community emission reduction plans.
At the same time, the new structure places large fixed claims on the fund before discretionary programs are considered. High-speed rail receives a prominent set-aside. Other statewide priorities compete for the remainder. Valley advocates have warned that without continued legislative attention, incentive programs that deliver the most cost-effective local nitrogen oxide and particulate reductions could see their share squeezed even as the overall program continues.
The Local Stakes
Air quality progress in the Valley has always depended on a combination of regulatory limits and voluntary incentive programs. Regulations set the floor. Incentives accelerate the turnover of the oldest, dirtiest engines that would otherwise remain in service for years. Agricultural operations, in particular, rely on these grants because the capital cost of new equipment is high and many operations run on tight margins.
When funding is robust, older Tier 0 and Tier 1 tractors leave the fields and nitrogen oxide emissions fall in measurable increments. When funding stalls, the replacement queue lengthens and the emission reductions needed for federal attainment plans become harder to claim. The same dynamic applies to the heavy-duty trucks that move goods along Highway 99 and Interstate 5. Cleaner engines and zero-emission technologies reduce both greenhouse gases and the pollutants that form ozone and fine particles.
Community-level investments matter in a different way. In neighborhoods that score high on CalEnviroScreen, money for air filtration, vegetative barriers, cleaner school buses, or reduced truck idling can improve the air people breathe day to day even while the broader regional attainment struggle continues. The new statutory funding for AB 617 provides a more reliable foundation for those projects, provided the dollars actually reach the Valley’s selected communities in sufficient volume.
Costs, Benefits, and Trade-Offs
Cap-and-Invest is designed to put a price on carbon. That price is paid, ultimately, by the industries and fuel suppliers covered by the program and is reflected to varying degrees in the cost of goods and energy. Valley residents and businesses experience those costs alongside the benefits of cleaner equipment and community projects. The distribution of costs and benefits is rarely even. Large agricultural operations and trucking firms that successfully secure grants can lower their long-term compliance costs. Smaller operators and households that do not receive incentives still face the broader price signals.
The program’s defenders argue that the alternative—uncontrolled emissions and continued nonattainment—carries higher public health costs in the form of asthma, cardiovascular disease, and lost workdays. Critics counter that the revenue is too often diverted to statewide priorities that deliver limited local air quality benefit, and that the Valley’s unique combination of geography, meteorology, and emissions sources requires more targeted investment than the current allocation formulas provide.
Both perspectives contain evidence. The Valley has recorded meaningful progress in reducing emissions from mobile sources and some stationary categories. It still fails to meet federal standards for ozone and particulate matter on a consistent basis. Incentive programs funded through Cap-and-Invest have been among the most effective tools for closing that gap. Whether they remain effective depends on the volume and stability of funding that survives the new priority order established in 2025.
What to Watch
Several indicators will show whether the renamed program is working for the Valley. The size of annual FARMER and related agricultural equipment allocations will signal whether the backlog of replacement applications can be cleared. The actual dollars reaching AB 617 communities will reveal whether the new statutory commitment translates into projects on the ground. Trends in ambient ozone and PM2.5 concentrations, especially in the northern and central portions of the Valley, will provide the ultimate public health measure.
Local governments, the Valley Air District, grower organizations, and community groups will continue to press Sacramento for priority. Their success or failure will determine whether Cap-and-Invest functions primarily as a climate accounting system or as a practical engine for cleaner air in the communities that need it most.
The air in the San Joaquin Valley will not clear overnight. The question raised by the 2025 reforms is whether the state’s flagship climate program will keep directing meaningful resources toward the engines, trucks, and neighborhoods that still drive the region’s pollution burden—or whether the Valley will be left breathing the same difficult air under a new name.
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