PURPOSE: This rule restricts the emission of excessive odorous matter.

1. (1) General Provisions.

   1. (A) No person shall emit odorous matter as to cause an objectionable odor on or adjacent to—

      1. 1. Residential, recreational, institution-

al, retail sales, hotel or educational premises;

1. 2. Industrial premises when air contain-

ing odorous matter is diluted with twenty (20) or more volumes of odor-free air; or

1. 3. Premises other than those in para-

graphs (1)(A)1. and 2. when air containing odorous matter is diluted with four (4) or more volumes of odor-free air.

1. (B) The previously mentioned requirement shall apply only to objectionable odors. An odor will be deemed objectionable when thirty percent (30%) or more of a sample of the people exposed to it believe it to be objectionable in usual places of occupancy, the sample size to be at least twenty (20) people or seventy-five percent (75%) of those exposed if fewer than twenty (20) people are exposed.

1. (2) Exception. The provisions of this rule shall not apply to the emission of odorous matter from the raising and harvesting of crops, nor from the feeding, breeding and management of livestock or domestic animals or fowl.

AUTHORITY: section 643.050, RSMo (1994).* Original rule filed March 14, 1967, effective March 24, 1967. Amended: Filed Aug. 15, 1983, effective Jan. 13, 1984.

*Original authority 1965, amended 1972, 1992, 1993.