Where It Comes From
Applied to farm soils to control weeds, fungi, and pests; converts in soil to MITC, which can move through soil and into the air [1][2].
How You Are Exposed
Breathing MITC vapors during or after nearby field applications; contact when entering treated fields too soon; rare drinking-water exposure due to rapid breakdown [1][2].
Why It Matters
Causes eye, nose, and throat irritation; coughing, headache, nausea, and breathing trouble; high levels can lead to severe lung injury. Odor is not a reliable safety warning [2][3].
Who Is at Risk
Farmworkers/applicators; people living or working near treated fields; children, older adults, and anyone with asthma or lung disease [1][2].
How to Lower Your Exposure
Heed posted field warnings and buffer zones; avoid treated areas until re-entry times end; during nearby fumigation, stay indoors, close windows, and use recirculating A/C; workers should follow label directions and use required protective gear; report strong, irritating sulfur-like odors [1][2][3].
References
- [1]U.S. EPA. Metam Sodium and Metam Potassium (MITC-generating pesticides): Registration Review decisions and risk assessments.
- [2]ATSDR. ToxFAQs for Methyl Isothiocyanate (MITC).
- [3]CDC/NIOSH. Pocket Guide to Chemical Hazards: Methyl isothiocyanate.