Current through Register Vol. 25-01, January 1, 2025
Section 422 - NITROGEN OXIDE STANDARDS422.1 Nitrogen Dioxide. The annual arithmetic means of nitrogen dioxide measured at an ambient air monitoring station shall not exceed: 100 micrograms per cubic meter (0.050 ppm).422.2 Sampling and analysis for nitrogen oxides shall be as outlined in Section 180.
Wash. Admin. Code Northwest Clean Air Agency, 400, 422