# COMAR Title 26 — Department of the Environment

## Subtitle 11 — Air Quality

### Chapter 31 — Quality Assurance Requirements for Continuous Opacity Monitors (COMs)

#### Regulation .08 Audit Frequency.

*COMAR 26.11.31.08*

A. Each COM shall undergo a performance audit at least once each calendar quarter. Successive quarterly performance audits shall not occur within 2 months.

B. A zero alignment audit shall be conducted at least annually, with each coming before a corresponding quarterly performance audit. Successive zero alignment audits shall not occur within consecutive quarters.

C. When conducting a performance or zero alignment audit, the owner or operator shall use the same output device as used to report emissions to the Department in the quarterly excess emissions report.