As part of transitioning South Coast AQMD’s NOx RECLAIM program to a command-and-control regulatory structure, amendments are proposed to Rule 218 and two new rules, Proposed Rule (PR) 218.2 and PR 218.3 are proposed for adoption. Specifically, Proposed Amended Rule (PAR) 218 will incorporate a phase-out provision that requires an owner or operator of any Continuous Emission Monitoring System (CEMS) subject to Rules 218 and 218.1 to transition to comply with PR 218.2 and PR 218.3 in accordance with the implementation schedule as specified in subdivision (d) of either PR 218.2 or PR 218.3, as applicable. PR 218.2 and PR 218.3 establish requirements and specifications for installation and operation for CEMS at non-RECLAIM and former RECLAIM facilities. Specifically, PR 218.2 focuses on CEMS administrative requirements and has been developed to: 1) incorporate provisions retained from Rule 218 but with updates to the certification process for CEMS modifications and reporting requirements; and 2) incorporate a new provision that would require the continuous operation of CEMS, except during qualifying CEMS maintenance and repair or when an emission source is offline for at least one week. PR 218.3 focuses on CEMS performance specifications and has been developed to: 1) incorporate provisions retained from Rule 218.1 but with modifications to span range, data acquisition and handling system, relative accuracy test audit, and calibration gas requirements; and 2) incorporate a new provision which provides specifications on data handling methods for data measured below 10 percent or above 95 percent of the upper span value, emission data averaging method, CEMS data availability requirements, and CEMS out-of-control period and alternative data acquisition.