I am looking for the names of some environmental alkylating agents (in context of DNA damages) found for example in the fume produced by industry. Most of the papers which I have found is concentrated on cigarette smoke, chemotherapy ect. I found something about methyl chloride, that is produced by plants and fungi, but also industrially. However there is no more details about that industrial part and in general the amount of methyl chloride in the air is rather low. Are there more relevant examples? Also I came across the information that alkylating agents may be found in food, but again there was no details.