City and Borough of Juneau
155 S. Seward Street
Juneau, Alaska 99801
tel. 907-586-5240
fax 907-586-5385

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Division of Lands and Resources

Air Quality - Open Burning



Call the woodsmoke hotline for up-to-date information regarding the Mendenhall Valley's air quality

Enforcement - Juneau Police Department - 586-0600

Please call JPD if you notice active burning and/or wood smokeoccuring during an Air Emergency

Further Information - Lands and Resources Office- 586-5252

Updated Monday, October 24, 2016 - 8:15 am


Air Emergencies

The CBJ Lands and Resources Division begins monitoring the Mendenhall Valley's air quality from October 1st through April 30th.


An air emergency will be announced through press releases, advertising, and by utilizing the11 neon yellow air emergency signs in the Valley when air particulate levels reach, or are currently at, an unhealthy level and weather conditions will not clear the air.



During an air emergency, all woodstove burning is prohibited until further notice as outlined in CBJ's ordinance 2008-28 regarding solid fuel-fired burning devices. Pellet Stoves are exempt from the wood stove regulations and can burn at any time, however masonary heaters cannot be used during an air emergency.


Air Emergency Sign Location Map

Detailed Map  - Mendenhall Valley Smoke Hazard Area

Wood Smoke Hazard Map 2


Open Burning

All open burning is prohibited in the Mendenhall Valley and Lemon Creek area from October 1st through April 30th. Please use the below permit application for open burning between May 1st-November 1st.

Open Burn Permit Application (May 1-November 1)

Open Burning Restriction Zone Map


What Does Poor Air Quality in the Valley Look Like?


Below are hourly air samples of fine particulates (pm 2.5) that were present in the Valley’s air during the 2015-16 air quality monitoring season. These samples were taken at the Department of Environmental Conservation’s Floyd Dryden Station, and demonstrate what is usually invisible to the eye: fine particulates from wood smoke.

Fine particulates from wood smoke are the ones that can lodge themselves deep into the lungs and significantly impact children, elders, and those with breathing difficulties. The darker the circles, the dirtier the air. If the air is clean, the hourly samples will run clear (almost invisible to the eye) when looking at the Beta Attenuation Monitor (BAM) tape. CBJ Lands and Resources staff monitors the data produced from these hourly air samples, and will call an air emergency if numerous readings in a row show that the air quality could threaten human health.


What Causes Poor Air Quality?


The use of woodstoves or open burning of material when conditions are favorable for an air inversion to form.


Photo taken from East Glacier Trail looking towards Montana Creek.


Notice the thick blanket of smoke shown above? That "blanket" or air inversion will continue to trap all the fine particulates from woodsmoke and open burning until wind or rain clean out the air. When it looks like an air inversion is forming, the City's goal is to temporarily stop the use of Valley woodstoves and prevent the high concentration of fine particulates underneath that smoky blanket.


Monitoring the Mendenhall Valley’s air quality would not be possible without the collaboration and support of the Department of Environmental Conservation, Division of Air Quality team and the National Oceanic and Atmospheric Administration, Juneau Forecast Office who collect and interpret the data. Additional partnerships are with the Juneau Police Department, who enforce the air emergencies and burn bans, and the CBJ Clerks Office, which has posted when air emergencies are in effect or cancelled on the CBJ Facebook.


On October 5, 2016, CBJ Lands and Resources staff along with Alaska Department of Environmental Conservation went on Juneau Afternoon to discuss the 2016-17 Air Quality Monitoring Program. If you missed the conversation, click the below KTOO link and start listening in at minute 46.


More Information

smokemap.jpg, 62 kB

CBJ Image