fumigant Archives

April 25, 2024

Postcard from California: State emits more of an obscure climate-heating gas than the entire rest of the US

By Bill Walker

Among US states, California is a leader in efforts to cut emissions of the greenhouse gases that fuel the climate crisis. But just three counties in Southern California emit far more of one little-known greenhouse gas than all other US states combined.

Blame termites – and the tragic, too-frequent mistake of replacing one environmentally harmful chemical with another that turns out to be just as bad.

Sulfuryl fluoride is a fumigant pesticide first made by Dow Chemical Co., marketed since 1959 as Vikane. To kill western drywood termites, pest control companies cover infested houses with tents and then pump in Vikane. Houses tented for fumigation are a common sight in Southern California, where warm, dry weather leaves wooden buildings highly susceptible to infestations of the hard-to-exterminate species.

The colorless, odorless, highly neurotoxic gas that kills termites is also a danger to humans. That’s why Vikane must be spiked with another toxic pesticide gas called chloropicrin, which has an intensely irritating smell that is meant to warn people against entering a house until the fumigant has dispersed in 24 to 72 hours.

California Department of Pesticide Regulation (DPR) records show that between 1992 and 2017, at least 16 Californians died from sulfuryl fluoride poisoning after going inside fumigated houses too soon. In the same period DPR recorded more than 200 cases of human exposure that caused breathing problems, dizziness, nausea, and other symptoms.

But the biggest problem with Vikane is that, when fumigation tents are removed and sulfuryl fluoride disperses into the atmosphere, it is a greenhouse gas much more powerful than carbon dioxide (CO2).

July 22, 2022

OIG probe finds EPA broke the rules in pesticide cancer evaluation

The Environmental Protection Agency (EPA) did not properly conduct the cancer risk for a widely used pesticide in a manner that could jeopardize human health, the Office of the Inspector General (OIG) said in a report issued this week.

In its July 20 report, the OIG cited a number of problems with how the EPA evaluated the cancer risk of the soil fumigant 1,3-Dichloropropene, (1,3-D). Among other problems, the EPA did not adhere to standard operating procedures and federal requirements in doing the assessment, the OIG found.

“These departures from established standards during the cancer assessment for 1,3-D undermine the EPA’s credibility, as well as public confidence in and the transparency of the Agency’s scientific approaches, in its efforts to prevent unreasonable impacts on human health,” the OIG said of the EPA.

1,3-D is one of the top three soil fumigants used in the United States. From 2014 through 2018, an average of approximately 37 million pounds of 1,3-D were applied to an average of 300,000 acres of agricultural crops annually.

The OIG probe came after the EPA changed the cancer classification in 2019 in a way that essentially downgraded the cancer risk and allowed for vastly increased exposures.