9 parts per million (ppm), three times the occupational short-term exposure limit
Santa Clarita had a record smoggy season last year, with 25 days exceeding the short-term exposure limit
The final standard, which is expected to prevent at least 79 cancer deaths over a 45-year working lifetime, also includes a 15-minute short-term exposure limit
(STEL) of 5 ppm and an action level of 0.
The CEL is the lowest of the short-term exposure limit
(STEL) of the American Conference of Governmental Industrial Hygienists (ACGIH), 2X the ACGIH threshold limit value (TLV), or 1% of the [LC.