(Air Resources Board)
(Smoke Management Guidelines)
80180. North Coast Air Basin
(A) Above 3,000 feet mean sea level* (msl), a
permissive-burn day will be declared when the following criteria are met:
(1) Near 4:00 a.m., the mean 500 millibar (mb) height
over the Basin is less than the limiting mean height given in Table 1 of
section 80320 (below).
(2) The expected 4:00 p.m. mean 500 mb height over the
Basin is less than the limiting mean height given in Table 1 of section
(A) Below 3,000 feet msl*, a permissive-burn day will be
declared when at least 3 of the following criteria are met:
(1) Near the time of day when the surface temperature is
at a minimum, the temperature at 3,000 feet above the surface is not
warmer than the surface temperature by more than 10 degrees Fahrenheit,
except that during July through November it is not warmer by more than
18 degrees Fahrenheit.
(2) The expected daytime temperature at 3,000 feet above
the surface is colder than the expected surface temperature by at least
11 degrees Fahrenheit for 4 hours.
(3) The expected daytime wind speed at 3,000 feet above
the surface is at least 5 miles per hour.
(4) The expected daytime wind direction in the mixing
layer has a component from the east and a speed of 12 miles per hour or
* In place of the standard 3,000 feet msl level,
the elevation may be specified in increments of 500 feet on a day-to-day
basis as determined from vertical temperature soundings.
NOTE Authority cited: Sections 39600, 39601, 41856 and
41859, Health and Safety Code. Reference: Sections 41854, 41855, 41856,
41857, 41859 and 41863, Health and Safety Code. HISTORY 1. Amendment of
subsections (a)-(b), repealer of subsection (c) and new footnote filed
3-14-2001; operative 3-14-2001 pursuant to Government Code section
11343.4 (Register 2001, No. 11).