Puget Sound Clean Air Agency

Residential burn ban protocols


The Puget Sound Clean Air Agency has been issuing wintertime burn bans during episodes of poor air quality since the late 1980s. During these burn bans, the Clean Air Agency has prohibited the use of primarily uncertified wood stoves and fireplaces in order to reduce pollution and lessen the impact on public health.

Our burn ban program has evolved over the years to reflect updates in health information and mandated air quality standards.

More restrictive burn ban requirements began in the 2008-2009 heating season, prompted by a more protective law enacted by the 2008 Washington State Legislature to align with stricter air quality health standards adopted in late 2006 by the U.S. Environmental Protection Agency (EPA).

These burn ban requirements are expected to provide improved effectiveness in clearing our air and protecting public health during wintertime air stagnations. Puget Sound residents who burn wood in their homes will be more affected by the new law and expected to periodically stop using all wood- and pellet-burning devices.

Burn ban program highlights

  • We will call Stage 1 Burn Bans on the basis of weather conditions and rising pollution levels.
  • We will call Stage 2 burn bans when fine particle pollution levels reach a trigger value set by state law.

When and why we call a burn ban

  • In September 2006, EPA tightened the 24-hour health standard for fine particle pollution, also known as PM2.5, from 65 to 35 micrograms per cubic meter. During its 2008 session, the state legislature modified the air quality trigger for a Stage 1 burn ban and adopted an air quality trigger for a Stage 2 ban at a PM2.5 concentration that is even lower than the previous Stage 1 trigger.
  • We will issue Stage 1 burn bans when weather conditions are predicted to create stagnant air and a build-up of pollution that:
    • exceeds a 24-hour average of 35 micrograms per cubic meter within 48 hours (King and Kitsap counties).
    • exceeds a 24-hour average of 30 micrograms per cubic meter within 48 hours (Pierce and Snohomish counties).
  • In some cases when PM2.5 levels are rising rapidly, we may call a Stage 2 burn ban without first calling a Stage 1 burn ban.
  • Forecast weather conditions will play a major role in determining when – or if – to issue a burn ban. For example, in certain circumstances when pollution levels have risen to the Stage 2 trigger, we may not issue a burn ban if we expect that weather conditions over the next 24 hours will clean out our area’s air pollution.
  • The Clean Air Agency issues daily Air Quality forecasts year-round to inform the public of expected conditions and health impacts based on EPA’s Air Quality Index.

For more information