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Burn Day Decision


California Code of Regulations

Sections 80180, 80320 and 80330

Burn Day Determination for North Coast Air Basin

California Code of Regulations

Title 17 (Public Health)

Division 3 (Air Resources)

Chapter 1 (Air Resources Board)

Subchapter 2 (Smoke Management Guidelines)

Article 3 (Metrological Criteria)

Section 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 80320 (below).

(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 less.

--------

 * 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).

 

Section 80320 (tables)

Limiting Mean 500-Millibar Heights* by Month

(in meters above sea level)

   
 
  Month  
 
   
 
  Table 1*  
 
   
 
  Table 2*  
 
   
 
  Table 3*  
 
   
 
  January  
 
   
 
  5710*  
 
   
 
  5750*  
 
   
 
  5630*  
 
   
 
  February  
 
   
 
  5710  
 
   
 
  5740  
 
   
 
  5620  
 
   
 
  March  
 
   
 
  5710  
 
   
 
  5740  
 
   
 
  5630  
 
   
 
  April  
 
   
 
  5720  
 
   
 
  5760  
 
   
 
  5660  
 
   
 
  May  
 
   
 
  5770  
 
   
 
  5800  
 
   
 
  5710  
 
   
 
  June  
 
   
 
  5820  
 
   
 
  5850  
 
   
 
  5780  
 
   
 
  July  
 
   
 
  5850  
 
   
 
  5880  
 
   
 
  5830  
 
   
 
  August  
 
   
 
  5870  
 
   
 
  5880  
 
   
 
  5840  
 
   
 
  September  
 
   
 
  5850  
 
   
 
  5870  
 
   
 
  5810  
 
   
 
  October  
 
   
 
  5820  
 
   
 
  5850  
 
   
 
  5760  
 
   
 
  November  
 
   
 
  5770  
 
   
 
  5810  
 
   
 
  5700  
 
   
 
  December  
 
   
 
  5730  
 
   
 
  5780  
 
   
 
  5630  
 
   

 

Section 80330

 General Criteria for Announcement of Permissive Burn, Marginal Burn or No-Burn Day

Notwithstanding the criteria listed in the preceding for each air basin, the Air Resources Board may announce permissive-burn, marginal burn, or no-burn days based on expected meteorological conditions and on the estimated effect on air quality of the agricultural burning and prescribed burning.

NOTE

Authority cited: Sections 39600, 41856 and 41859, Health and Safety Code. Reference: Sections 41854, 41855, 41856, 41857, 41859 and 41863, Health and Safety Code.

 


Last Update 11/13/2009