Under the provisions of the 1990 Federal Clean Air Act (FCAA) the southern portion of Clark County was designated a non-attainment area for carbon monoxide (CO) and ozone (O3). This required a ban on outdoor burning within the non-attainment area and new restrictions on auto emissions and industrial pollutants. The area has since achieved attainment status and was designated a CO/O3 maintenance area. However, the restrictions remained in place to assure continuing attainment with the FCAA.
With the revision of the Washington Administrative Code (WAC) 173-425 in 2000, Washington's outdoor burning rules were revised. As of December 31, 2000 outdoor burning was prohibited in cities with a population of greater than 10,000 and their Urban Growth Areas (UGA). Prohibitions also apply in adjacent areas with a population density of one thousand or more persons per square mile and areas with a reasonable alternative to burning. As of January 1, 2007 all urban growth areas in the state of Washington are permanent no burn areas.
The above rules affect Clark, Cowlitz and Lewis Counties as follows:
Skamania and Wahkiakum Counties: Currently, cities/population densities in these counties do not meet any of the above criteria and therefore they are not currently designated as permanent no burn areas.