California Regulators Void Nine Months of Pesticide Air-Monitoring Data, Raising Concerns for Farmworker Safety
California's Department of Pesticide Regulation (DPR) has voided nearly nine months of air-monitoring data for two highly toxic fumigants, 1,3-dichloropropene (1,3-D) and methyl bromide. The data, collected from October 24, 2025, through June 30, was discarded due to a quality-control problem at the state laboratory responsible for analysis. Reference standards for these chemicals were found to have significantly degraded, by 18 to 96 percent, over a nine-month period. This issue has left regulators without crucial information to assess farmworkers' exposure to these cancer-causing pesticides. Advocacy groups like Californians for Pesticide Reform have expressed significant concern, questioning the state's ability to protect workers and communities if accurate exposure levels cannot be determined. Methyl bromide, a potent neurotoxin, is still applied in California under critical use exemptions, while 1,3-D, a known carcinogen, is banned in 40 countries but widely used in California agriculture.