Mendocino County

Air Quality Management District
Wildfire Smoke Protection  Air Advisory

Portable Engines

All portable engines having a maximum rated horsepower of 50 bhp and greater and fueled with diesel are subject to this regulation.

A portable engine is one that moves to multiple locations and is never in one location for more than 12 months.

Portable equipment may be registered with the State of California Air Resources Board – however this equipment CANNOT be used at a fixed location for more than 12 months.

What's Portable: "means designed and capable of being carried or moved from one location to another. Indicia of portability include, but are not limited to, wheels, skids, carrying handles, dolly, trailer, or platform. For the purposes of this regulation, dredge engines on a boat or barge are considered portable.

The engine is not portable if:

(A) the engine or its replacement is attached to a foundation, or if not so attached, will reside at the same location for more than 12 consecutive months. The period during which the engine is maintained at a storage facility shall be excluded from the residency time determination. Any engine, such as a back-up or stand-by engine, that replace engine(s) at a location, and is intended to perform the same or similar function as the engine(s)being replaced, will be included in calculating the consecutive time period. In that case, the cumulative time of all engine(s), including the time between the removal of the original engine(s)and installation of the replacement engine(s), will be counted toward the consecutive time period; or

(B) the engine remains or will reside at a location for less than 12 consecutive months if the engine is located at a seasonal source and operates during the full annual operating period of the seasonal source, where a seasonal source is a stationary source that remains in a single location on a permanent basis (at least two years) and that operates at that single location at least three months each year; or

(C) the engine is moved from one location to another in an attempt to circumvent the portable residence time requirements.

Portable Engine Resources:

Portable Diesel Engines Information (PDF)

Statewide Portable Equipment Registration Program (PERP)

Burn Day Status

For todays burn day status please call 707-463-4391. .

Burn Permit Application> Click Here
SMP Online Burn Request> Click Here

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Air Quality for Mendocino

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News / Advisories

Mendocino County: Fire Season - Burning is allowed only on permissive burn days with a valid burn permit.

Air Quality Advisory For Mendocino County covering smoke impacts from wildfires in Northern California (month of August 2020). Click Here for More Information

COVID-19 AIR DISTRICT OPERATIONS - The public counter will be closed to walk-in customers. Click Here for More Information

AB 617 Community Air Protection Incentive Projects - AB 617 Community Air Protection Incentives to Reduce Emissions. Click Here for More Information

Volkswagen Environmental Mitigation Trust - provides about $423 million for California to mitigate the excess nitrogen oxide emissions caused by VW's use of illegal emissions testing defeat devices in certain VW diesel vehicles.. Click Here for More Information

Air District Relaxes Portable Diesel Engine Enforcement - ARB has determined the standards for DPM may not be feasible. Click Here for More Information

The District Mission

  The mission of the Mendocino County Air Quality Management District is to protect and manage air quality, an essential public resource upon which the health of the community depends. 

  Mendocino County Air Quality Management District is one of 35 local Air Districts in California.

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