Instruction Rules of Thumb
By Zone, Wind Direction, Speed, and Maximum Mixing Height
Spring Fall Zone Map (Click for spring guidance criteria.)
601 North Coast Range 601 North Coast Range
602 North Coast Range 602 North Coast Range
603 North Coast Range 603 North Coast Range
605 Cascades 605 Cascades
606 Cascades 606 Cascades
607 Cascades 607 Cascades
608 Cascades 608 Cascades
609 Cascades 609 Cascades
610 Cascades 610 Cascades
611 Cascades 611 Cascades
612 North Coast Range 612 North Coast Range
615 South Coast Range 615 South Coast Range
616 W of R8W 616 W of R8W
616 E of R9W 616 E of R9W
616 Cascades 616 Cascades
617 Cascades 617 Cascades
618 South Coast Range 618 South Coast Range
619 South Coast Range 619 South Coast Range
620 Coast Range 620 Coast Range
620 Cascades 620 Cascades
622 Cascades 622 Cascades
623 Cascades 623 Cascades
Siskiyous Siskiyous
601 602 605 603 606 607 608 609 610 611 612 615 616 Coast Range West 616 Coast Range East 616 Cascades 617 618 619 620 Coast Range 620 Cascades 622 623 Siskiyous east side Policy Guidance