A cylinder used to prepare a laboratory standard is an unglamorous place for a statewide data problem to begin. But a faulty cylinder degraded the original standard behind a set of California air-monitoring results.
CDFA’s Center for Analytical Chemistry told the Department of Pesticide Regulation it is recalling and voiding results for methyl bromide, cis-1,3-dichloropropene and trans-1,3-dichloropropene supplied to DPR’s Air Program from October 24, 2025, through June 30, 2026, according to the CDFA notice.
A standard fails upstream
The agency attributes the recall to significant degradation of the original laboratory standard caused by the faulty cylinder. That means the concern is with the measurements’ analytical basis, not a new finding about conditions at any particular orchard. CDFA’s statement does not describe replacement values.
A voided result is not a low reading, and it is not a high one. It is a result the agency says should no longer stand as a valid measurement.
What pistachio records can show
The notice concerns DPR Air Program testing; it does not describe testing of pistachio nuts or shipments. That boundary matters for growers and handlers sorting a pesticide-air question from a crop-quality question.
The announcement does not identify county, orchard, or sample locations. Until DPR connects the withdrawn results to specific records, a pistachio operation cannot tell from this notice alone whether a local air-monitoring reference is among them. The Spanish-language statement describes the same recall.
For managers, the useful distinction is between a measurement that has been withdrawn and any separate evidence collected at a site. The notice addresses the former; it does not report a pistachio-specific event.