Mendocino County

Air Quality Management District
Wildfire Smoke Protection  Air Advisory

Naturally Occurring Asbestos (NOA)

Naturally Occurring Asbestos (NOA)

Like many counties in Northern California, Mendocino County has areas that contain Naturally Occurring Asbestos (NOA). State regulations, enforced by the District, may affect quarries, grading and surfacing projects.

NOA Grading and Surfacing Application Process and Forms

Outline of the NOA application process

NOA Dust Mitigation Plan Application (and exemption request)

NOA Links

Copies of the State NOA Regulations 17 CCR 93105 and 93106

California Air Resources Board Web Page for Naturally Occurring Asbestos

USGS Flyer on Asbestos

Letter from Office of Planning and Research on how to deal with Naturally Occurring Asbestos in CEQA documents

District NOA Policy


The District, working with other agencies, has produced a series of maps of areas likely to contain NOA in Mendocino County. These maps are not parcel specific and only show areas where NOA is more likely, the actual presence of NOA can only be determine by an expert.

NEW! Google Earth NOA map

MAP of likely areas to contain NOA in Mendocino County

MAP of the Ukiah Area

MAP of the Willits Area

MAP of the Hopland Area


Under 17 CCR 93105 & 93106, only a State Registered Geologist can document that property is free of Naturally Occurring Asbestos. The District cannot recommended a particular Geologist, but the state Department of Consumer Affairs does provide a searchable online database of Registered Geologists.

Searchable Database of Registered Geologists

MCAQMD Geologic Evaluation Guidelines (for consultants)

Guidelines for Geologic Investigations of Naturally Occurring Asbestos in California SP-124 (for consultants)

Contact the District (707) 463-4354 with any questions.

Burn Day Status

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

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

Credit Card Payments

Service FEES are assessed to all Credit Card transactions by govPayNet:

Air Quality for Mendocino

Current Air Quality Index for county:
Observed on --/--/-- at --:00



AQI Animation -

More Air Quality Information:

Map data is collected from

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.

Learn more