(1) No person shall cause or contribute to concentrations of hydrogen sulfide in the ambient air which exceed the following standard:
- (a) hourly average: 0.05 ppm, one-hour average, not to be exceeded more than once per year.
- (2) Measurement method: For determining compliance with this rule, hydrogen sulfide shall be measured by the methylene blue spectrophotometric method, as more fully described in "Methods of Air Sampling and Analysis, Second Edition"
- (1977) Method P and CAM 126-6, or by an approved equivalent method.
Authorizing statute(s): 75-2-111, 75-2-202, MCA
Implementing statute(s): 75-2-202, MCA
History: NEW, 1980 MAR p. 2399, Eff. 8/15/80; TRANS, from DHES, 1996 MAR p. 2285.