40 C.F.R. § 58.61
Monitoring other pollutants.
Cite as 40 C.F.R. § 58.61 (2026)
The Administrator may promulgate criteria similar to that referenced in subpart B of this part for monitoring a pollutant for which an NAAQS does not exist. Such an action would be taken whenever the Administrator determines that a nationwide monitoring program is necessary to monitor such a pollutant. [71 FR 61303, Oct. 17, 2006]