Assertion: carbon tetrachloride's concentration | /r/HasProperty | ppm
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text: Most carbon tetrachloride that escapes to the environment is found as a very stable gas, which can be smelled by people in concentrations as low as 10 parts per million (ppm), according to the US Agency for Toxic Substances and Disease Registry (ATSDR, 2005) and US Environmental Protection Agency (EPA, 2010).