Ambient Air Monitoring Regulations: Correcting and Other Amendments

The EPA is taking direct final action on "Ambient Air Monitoring Regulations: Correcting and Other Amendments" to correct and clarify parts of a recent final rule published on October 17, 2006, that amended the ambient air monitoring requirements for criteria pollutants. These errors included several instances where the wording in the preamble and regulatory text were not completely consistent, several regulatory text passages that contained some imprecise language, two instances of regulatory text omission, an outdated address reference, and numerous publication errors in tables and equations. EPA is also amending the monitoring rule to allow EPA Regional Administrators to approve departures from the minimum number of PM<INF>10</INF> monitors otherwise specified in the rule. The October 17, 2006, final rule revised requirements for reference and equivalent method determinations, modified requirements for general monitoring network design, and modified other requirements pertaining to quality assurance, annual network plans and assessments, data reporting, monitoring methodology, and probe and monitor siting criteria. All other preamble and regulatory text printed in the October 17, 2006, final rule is correct.