Quick Check
To determine if your agricultural operation requires an air permit, you may perform a "Quick Check" by answering the following questions.  However, it should be noted that this "Quick Check" is based on specific assumptions (e.g., crop water usage factors, well depths, emission factors, and equipment usage) that are not accurate for all farms.  In order to determine whether or not permits are required with more certainty, (a) emissions should be calculated and compared with District permitting thresholds (see manual emissions calculator), or (b) emissions should be calculated using the District's automated calculator (see "Automated Calculator").

QUICK CHECK: If you answer "yes" to any of the questions below, continue to "Automated Calculator" for a more accurate analysis.

1. Farming operations using stationary internal combustion engines with horsepower greater than 50 bhp, 
2. Dairy operations with 1,000 milk cows or 1,190 milk cow equivalent, 
3. Feedlot operations with 2,252 or more steers, 
4. Broiler ranch with 650,000 or more birds,
5. Laying hen ranch with 500,000 or more birds, or
6. Turkey ranch with 100,000 or more birds

* This is a conservative number.  Depending on the type of dairy, you may be able to exceed this number without requiring permits.  Please contact Ramon Norman at (559) 230-5909 for further information.  

Otherwise, you do NOT need an air permit.


Automated Calculator
We must calculate the emissions from your agricultural operation to determine if you will need to obtain a permit. A permit will be required if the calculated NOx and VOC emissions from your agricultural operation is equal to or greater than 12.5 tons/year.

In order to determine this, please answer the following six questions.

Start Calculator
Total Emissions

NOx: 0 tons/yr
VOC: 0 tons/yr

NOx(Title V): 0 tons/yr
VOC(Title V): 0 tons/yr

STEP 1/6: Emissions From Dairy Cattle
If you have a dairy operation, please enter the number of dairy cows you have. Otherwise, leave the fields blank and click on CONTINUE.

Milking Cows ?
Dry Cows ?
Heifers (15-24 months) ?
Heifers (7-14 months) ?
Heifers (4-6 months) ?
Calves (<3 months) ?

Go Back Continue
Total Emissions

NOx: 0 tons/yr
VOC: 0 tons/yr

STEP 2/6: Emissions From Cattle Feedlots
If you own a cattle feedlot, please enter the number of cattle you feed at your feedlot. Otherwise, leave the field blank and click on CONTINUE.

Feeder Cattle ?

Go Back Continue
Total Emissions

NOx: 0 tons/yr
VOC: 0 tons/yr

STEP 3/6: Emissions From Poultry
If you have an egg ranch, please enter the number of laying hens at your ranch. Otherwise, leave the field blank and click on CONTINUE.

Laying Hens ?

Go Back Continue
Total Emissions

NOx: 0 tons/yr
VOC: 0 tons/yr

STEP 4/6: Emissions From Poultry
If you have a poultry ranch, please enter the maximum number of birds at your ranch at any one time and the number of days the poultry houses are empty each year. Otherwise, leave the fields blank and click on CONTINUE.

Number of Birds Empty Days
Broiler Chickens ?
Turkeys ?

Go Back Continue
Total Emissions

NOx: 0 tons/yr
VOC: 0 tons/yr

STEP 5/6: Emissions From Gasoline Storage Tanks
If you have any gasoline storage tanks, please enter the number of gallons of gasoline (not diesel, propane, nor lpg) dispensed annually. Otherwise, leave the fields blank and click on CONTINUE.

Aboveground Tanks ?
Belowground Tanks ?

Go Back Continue
Total Emissions

NOx: 0 tons/yr
VOC: 0 tons/yr

STEP 6/6: Emissions From Internal Combustion Engines (> 50 bhp)
If stationary spark-ignited (gasoline, LPG, or natural gas) or compression-ignited (diesel) engines are used in your operation, i.e. irrigation pumps, please enter the combined horsepower for each category and the average annual hours of operation for each engine. Only include engines with rated horsepower greater than 50 bhp. Otherwise, leave the fields blank and click on EVALUATE.

Total Horsepower (BHP) Annual Hours of Operation
(estimated average per engine)

Diesel (TIER 0)
Diesel (TIER 1)
Diesel (TIER 2)
Diesel (TIER 3)
Diesel (Unknown)
Spark (Rich Burn 4702 Compliant)
Spark (Lean Burn 4702 Compliant)
Spark (Unknown/Other)

Go Back Evaluate

NOx: 0 tons/yr
VOC: 0 tons/yr

Go Back Print Start Over