Quoted from athens95:How many PPM's will they turn off the intake?
I looked into this. Can't verify the information, but I read where exposure to only 100ppm in monkeys caused tumors or other harmful body effects. I also read safety standards for workers around vinyl chloride set the maximum exposure limit to just 1ppm! That's only 0.0001%!
One part per million (ppm) denotes one part per 1,000,000 (106) parts, and a value of 10−6. It is equivalent to about 32 seconds out of a year or 1 mm of error per km of distance traversed.
