California Code, Business and Professions Code - BPC § 8505.1

(a) Except as provided in subdivisions (b) and (c), for the purpose of this act, “fumigation” shall be defined as the use within an enclosed space for the destruction of plant or animal life, a substance having a vapor pressure greater than 5 millimeters of mercury at 25 degrees centigrade when the substance is labeled for those purposes.

The following is a list of lethal fumigants:

(b) For the purpose of this act, “warning agent” is any agent used in combination with any fumigant that lacks warning properties.

The following is a warning agent:

Chloropicrin.

The board may adopt, and may as necessary amend, by regulation, a list of warning agents.

(c) For the purpose of this act “simple asphyxiants” shall not be deemed to be fumigants.

The following is a list of simple asphyxiants: