# COMAR Title 26 — Department of the Environment

## Subtitle 11 — Air Quality

### Chapter 20 — Mobile Sources

#### Regulation .01 Visible Emissions from Ships.

*COMAR 26.11.20.01*

A person or agent may not cause or permit the discharge of emissions from any ship in excess of the following limits:

Operating Mode
            Chart Number
            Allowable Time
          
        
        
          
            A. Underway, at berth, or at anchor
            20%—1
            No limit.
          
          
            B. Soot blowing:  (1) Underway within 1 mile (1.6 kilometer) of any shore
            —
            No soot blowing allowed.
          
          
            (2) At berth or anchor:   (a) Within first or last 24 hours of arrival or departure
            —
            No soot blowing allowed.
          
          
            (b) Any other 24-hour period
            No limit.
            15 minutes for each boiler in operation provided that no nuisance is created.
          
          
            C. Cleaning and adjusting of combustion equipment while at berth or anchor
            40%—2
            Not to aggregate more than 4 minutes in any 60-minute period.
          
          
            D. Start-up of cold boiler or engine
            No limit
            5 consecutive minutes.
          
          
            
            60%—3
            10 consecutive minutes additional.
          
          
            E. Anchoring, berthing, or other maneuvering requiring rapid changes in power
            80%—4
            No limit.
          
          
            F. Upset/breakdown/emergency casualty or Coast Guard safety tests
            No limit
            No limit. The control officer shall be notified as to the reason for the excessive emissions.
          
          
            G. Docktrials of new or rebuilt boilers or engines
            No limit
            No limit provided a nuisance is not created and the control officer has been notified before 3 p.m. the day before the docktrials are to be conducted.