Quote:
Originally Posted by MrDK
H2S is considered toxic if the exposure is in excess of 10 PPM continuously (avg) over an 8-hour period or an instantaneous exposure of 20+ PPM. In other words, in open air there is no way you can be harmed from the gases that escapes the sewer.
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I thought the TVEL of H2S had been reduced to 5ppm?