Moss Landing Air Monitoring: County Documented July Cutback in Hours and Routine Metals Testing

MOSS LANDING HEIGHTS, Monterey County — October 29, 2026. A Monterey County public notice from July 20, 2026 documents a temporary change to air monitoring around the Moss Landing battery-fire cleanup site. The notice says monitoring stations had moved to daytime working hours only, and routine laboratory analysis of air samples for metals had been temporarily suspended under a protocol Vistra reported to the county.

This is a review of an earlier official notice, not a claim that the July protocol remains in effect today. A separate fire occurred at the site on September 18, and the U.S. Environmental Protection Agency described additional emergency monitoring as part of that later response.

What did the county’s July notice actually say?

The county reported that Vistra notified it of changes effective July 6, 2026. According to the county’s July 20 public notice, air monitoring stations were operating only during daytime work because battery removal was not occurring overnight or on weekends, and demolition was not taking place at the time.

Air samples continued to be collected. However, the county said routine laboratory analysis for metals was suspended temporarily. The notice identified exceptions: samples would be analyzed for metals if 24-hour average PM2.5 screening levels were exceeded or if National Weather Service Wind Advisory conditions occurred.

Was the adjustment permanent?

No permanent change was established in the county’s notice. The July document explicitly described the protocol as temporary and said additional changes were planned ahead of the resumption of demolition work in the fall. That statement should not be stretched into an assertion that the same schedule or trigger rules were still operating in late October.

What happened afterward?

EPA’s September 18 incident account says a portion of damaged batteries caught fire again that morning. Vistra activated an emergency plan including additional monitoring and sampling. The county issued a precautionary shelter-in-place order near the site, later lifted that afternoon. For the event itself, see our separate September 18 fire report.

The July notice and September fire update therefore describe different stages of the response. Neither document, standing alone, establishes the complete air-monitoring timetable or all metals-test results for October 29. California58 has not independently verified those present-day details.

What residents can ask officials

For neighboring households, the key outstanding questions are whether nighttime monitoring resumed after September’s flare-up, which laboratory samples are currently analyzed for metals, where the latest results are posted, and how officials notify people if screening thresholds are exceeded. Residents can review EPA’s cleanup and air-monitoring FAQs and seek the latest protocol directly from the agencies.

Verified source documents

County of Monterey: Temporary Changes to Air Monitoring Operations in Moss Landing, July 20, 2026; EPA: Moss Landing battery fire response timeline, September 18 entry; EPA official FAQs.

Editorial note: This is a documentary follow-up about a dated monitoring-policy change, distinct from our report on the September fire. Sources reviewed October 29, 2026. No claim is made that today’s air is safe or unsafe on the basis of the older schedule.

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