Section 402.353 - Sound-Level Measurements(a) If audiometric testing is not conducted in a stationary acoustical enclosure, sound-level measurements must be conducted at the time of the testing to ensure that ambient noise levels meet permissible standards for testing threshold to 20 dB based on the most current American National Standards Institute "ears covered" octave band criteria for Permissible Ambient Noise Levels During Audiometric Testing.(b) A dBA equivalent level may be used to determine compliance.(c) The commission shall adopt rules necessary to enforce this section.Amended by Acts 2015, Texas Acts of the 84th Leg. - Regular Session, ch. 838,Sec. 1.119, eff. 9/1/2015. Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. 9/1/1999.