Chris Del Hierro July 26, 2022 New Mexico Environment Department – Air Quality Bureau, Ozone Precursor Rules: Chris Del Hierro July 26, 2022 NMAC 20.2.50 – Oil and Gas Sector – Ozone Precursor Pollutants was enacted to reduce Ozone precursors, NOx, and VOC emissions, in Chaves, Dona Ana, Eddy, Lea, Rio Arriba, Sandoval, San Juan, and Valencia Counties.