Editor's Note: This article has been updated to reflect that the board item was continued to the next meeting rather than voted on.
San Diego just took a step toward considering a local crackdown on warehouse hubs and the diesel trucks that serve them, with the county's Air Pollution Control District governing board hearing public comment on proposed tougher rules aimed at cutting pollution in freight-heavy neighborhoods, though the item was continued to the next board meeting.
Board Considers Rulemaking Push
At an often-contentious meeting, the Governing Board heard more than 30 public comments on a proposal to direct staff to start drafting a warehouse “indirect source” rule and related truck measures. As reported by CBS 8, advocates urged the district to go beyond federal standards, while industry speakers warned the move could backfire economically.
The item was continued to the next board meeting rather than being voted on. If approved in the future, it would send the Air Pollution Control District into a formal rule-development process that will determine just how strict any future regulations might be.
What Staff Would Study
District materials show staff would evaluate a Warehouse Indirect Source Rule (Rule 56) that could apply to facilities at different size thresholds, including a 100,000-square-foot tier and a 50,000-square-foot tier with informational requirements. The menu of possible compliance options includes low-NOx engines, zero-emission trucks, truck-idling controls and mitigation fees.
The district's ISR framework lays out scenarios and models potential emission cuts. Staff estimated that facilities above 50,000 square feet could deliver a nitrogen-oxide (NOx) reduction as high as 36.1 tons per year, with fine particulate (PM2.5) reductions near 0.26 tons per year, according to the San Diego County Air Pollution Control District. The analysis also notes that roughly 6,700 buildings across the county are classified as warehouses, ranging from small storage spaces to mega fulfillment centers.
Why Advocates Pushed For It
Environmental and community groups argue the change is long overdue, especially for portside and border neighborhoods that absorb a disproportionate share of freight traffic and its exhaust. The Environmental Health Coalition has pressed for local action, pointing out that a relatively small slice of heavy trucks is responsible for an outsized chunk of diesel emissions.
The group contends that local warehouse and truck rules can speed up fleet electrification and cut health harms, particularly in under-resourced communities that live closest to busy freight corridors.
Industry Warns Of Costs And Job Risks
Opponents at the meeting countered that a “no” vote would help protect the region's competitive edge and shield local jobs. They argued that steep compliance costs could push some businesses to move operations elsewhere rather than retrofit fleets or facilities.
As CBS 8 reported, warehouse operators and several business groups urged the district to lean more on incentives and voluntary programs while staff complete their technical work on the rule.
Next Steps And Legal Hurdles
If the board approves the measure at a future meeting, staff will draft proposed rule language, hold public workshops and conduct environmental and socioeconomic studies before bringing anything back to the Governing Board for further action, according to district planning documents.
The district's white paper also flags legal and federal coordination questions that could shape the final outcome. Those include limits on local authority over mobile sources, along with the need to coordinate with the California Air Resources Board and potentially the U.S. Environmental Protection Agency, issues that could influence both the timing and design of any eventual rule, per the San Diego County Air Pollution Control District.
