This rulemaking will consider two amendments to the existing rule. First, it will explore adding the definition of “flame cap kilns” and “silvicultural burning” in rule to align with amendments made to RCW by Substitute Senate Bill (SSB) 6121. Adding the definitions will not change the existing laws on what, where, and when burning is legal. Second, this rulemaking will address the air curtain incinerator permitting process. Current technology for air curtain incinerators makes it difficult to meet some emission limits, and therefore permit applications for ACIs require additional consideration and information. This requires additional work by the applicant and Ecology and additional time needed to issue the necessary permit. With proper siting criteria and operation standards, ACIs may still be more beneficial to air quality than open burning. This will also not change the existing laws related to burning. The area(s) most likely to be impacted if there is an increase in emissions are those where burning takes place frequently, such as the central and eastern regions of the state. In addition to the two potential amendments mentioned above, this rulemaking may also consider other amendments to these chapters to clarify language and improve regulatory requirements for air quality.