California’s Department of Pesticide Regulation released results from its annual air monitoring program, again showing that all of the pesticides tested for in 2025 were found below levels that indicate a health concern.

The 2025 Air Monitoring Network Report summarizes DPR’s air monitoring activities and findings for last year. This includes data collected across four monitoring sites for pesticides and breakdown products.

The agency also released results from a separate ongoing study of the pesticide 1,3-D, a known carcinogen.

Both reports were updated to reflect the California Department of Food and Agriculture’s recall and voiding of some air monitoring data due to significant degradation of a laboratory reference standard.

As a result, the 2025 reports include full-year results for 38 pesticides and degradants and nine months of 1,3-D and methyl bromide data that were not affected by the recall.

In total, nine compounds were detected at quantifiable concentrations in 2025. Of those, all detected concentrations were below health-based screening levels and regulatory targets, DPR said.