Air permits issued by EPA Region 10 » Technical memoranda concerning sawmills referenced by some permits issued by EPA Region 10. You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more. EPA Region 10 HAP and VOC Emission Factors for Lumber Drying (PDF)(38 pp, 380 K) Particulate Matter Potential to Emit Emission Factors for Activities at Sawmills, Excluding Boilers, Located in Pacific Northwest Indian Country (PDF)(4 pp, 232 K)