Wash. Admin. Code Northwest Clean Air Agency, 400, 420

Current through Register Vol. 25-01, January 1, 2025

Section 420 - CARBON MONOXIDE STANDARDS

420.1 Carbon monoxide measured at an ambient air monitoring station shall not exceed:

420.11 10 milligrams per cubic meter (9.0 ppm) eight (8) hour average concentration more than once per year at any location where people would be exposed to such concentration for eight (8) hours or more.

420.12 40 milligrams per cubic meter (35.0 ppm) one (1) hour average concentration more than once per year.

420.2 Sampling and analysis to determine compliance with this Section shall be as outlined in Section 180 or equivalent as determined by the Control Officer.

Wash. Admin. Code Northwest Clean Air Agency, 400, 420

AMENDED: October 13, 1982, April 14, 1993