


                              Mojave Desert AQMD
                                   Rule 401
                    Maricopa County Air Pollution Control 
                                   Rule 300
                            San Joaquin Valley APCD
                                   Rule 4101
                               South Coast AQMD
                                   Rule 401
Opacity Limits
Not to exceed 20% opacity for periods aggregating more than 3 minutes in any one hour.
Not to exceed 20% opacity for periods aggregating more than 3 minutes in any 60-minute period.
                           Not to exceed 20% opacity
         for periods aggregating more than 3-minutes in any one hour.
Not to exceed 20% opacity for a period aggregating more than 3 minutes in any one hour.
Source-specific Opacity Limits
1) Abrasive Blasting
- 20% for indoor operations using noncertified abrasive blasting material;
- 40% opacity for more than 3 minutes in any hour for outdoor operations using: wet abrasive blasting, hydro blasting, vacuum blasting, or abrasives certified for outdoor use.

2) Drinking Water Systems
- 40% opacity limit emissions from any diesel auxiliary engine or generator used exclusively for drinking water systems.

3) Gas Turbines
- visible emissions from gas-fired combustion turbines during startup and shutdown may exceed 20% for not more than 2 hours provided the visible emissions do not exceed 40% aggregating more than 3 minutes in any one hour.

4) Pile Drivers
- visible emissions from pile drive operations shall not exceed 20%; or
- for no more than 4 minutes per pile if operating on kerosene, smoke suppressing additives and synthetic lubricating oil.

5) Federally Regulated Industries
- in addition to be general opacity limit in this rule, applicable sources shall comply with any Visible Emission limit codified in 40 CFR Part 60, 40 CFR Part 61, or 40 CFR Part 63 
1) Fugitive Dust from Dust-Generating Operations 
- not to exceed 20% opacity (Rule 310)

2) Fugitive Dust from Non-Traditional Sources of Fugitive Dust
- not to exceed 20% opacity (Rule 310.01)

3) Abrasive Blasting 
- not to exceed 20% opacity for more than three minutes in any 60-minute period (Rule 312)

4) Nonmetallic Mineral Processing 
- not to exceed between 7% and 20% opacity, depending on the activity and date of construction, modification, or reconstruction of the facility (Rule 316)

5) Power Plant Operation
- not to exceed 20% for any six-minute averaging period, except during fuel-switching startup process, when it may not exceed 40% opacity (Rule 322)

1) Melting, Heating, or Holding Asphalt or Coal Tar Pitch for On-Site Roof Construction or Repair
- not to exceed 40% for periods aggregating more than 3 minutes in any one hour 

2) Diesel Pile Driving Hammers
- not to exceed 40% for periods aggregating more than 3 minutes in any one hour 


Exemptions
1) Open burning covered by Rule 444.
2) Equipment breakdown event in accordance with District Rule 430.
3) Aircraft distributing agricultural aids over land.
4) Ag. operations for group of crops or raising animals/fowl.
5) Use of visible emission generating equipment in training sessions conduct by gov. agencies for certifying observers.
6) Emissions from vessels using steam boilers during emergency boiler shutdowns for safety reasons or tests.
7) Dust emissions from small rock crushing facilities.
8) Emissions from vessels during a breakdown condition.
9)  Smoke emissions from teepee burners during disposal of forestry and agricultural residues when the emissions result from the startup or shutdown of the combustion process or malfunction of equipment.
10) Smoke emissions from burners used to produce energy and fired by forestry and agricultural residues with supplementary fossil fuels when the emissions result from the startup or shutdown of the combustion process or from the malfunction of emission control equipment. 
11) Emissions from small methanol fuel manufacturing plan. This exemption shall remain in effect until 5 years after construction of the plant.
12) The use of an obscurant for the purposes of training personnel and testing military equipment.
13) Fugitive dust emissions generated for the purposes of training military personnel and testing military equipment by the Department of Defense
14) The use of an orchard, field crop or citrus grove heater which does not produce unconsumed solid carbonaceous material at rate in excess of that allowed by State law.

1) Charging electric arc furnaces for which construction commenced before February 2, 1963 shall not exceed 40% capacity.
2)  Emergency diesel generators (EDGs) and equipment.
3)  Firing of ordnance at test facilities.
4)  Opacity training
1) Smoke from fires set by or permitted by any public officer.
2) Smoke from fires set pursuant to a permit on an industrial property.
3) Open burning, prescribed burning
or burning permitted or exempted by Rule 4103 (Open Burning) or Rule 4106 (Prescribed Burning).
4) The use of orchard heater which does not produce unconsumed solid carbonaceous matter at a rate of 1 gram per minute.
5)  Use or aircraft for ag. Distribution.
6)  Open outdoor fires used for cooking or recreation.
7)  Emissions from instruction or certification of individuals in the evaluation of visible emissions.
8) Wet plumes where the presence of uncombined water is the only reason for the failure of an emission to meet the limit.
9) Emissions from maritime vessels using steam boilers during emergency boiler shutdowns.
10)  Emissions from maritime vessels during a breakdown condition.
11)  The use of an obscurant for the purposes of training personnel and testing military equipment.
12)  Emissions subject to or exempt from Regulation VIII (Fugitive PM10 Prohibitions).
1) Asphalt pavement heaters.
2) Asphalt blasting operations.
Test Methods
Method 9
Method 22
Method 9
Method 9
40 Code of Federal Regulations Part 60
Appendix B  -  Performance Specifications 1 for determination of in-stack opacity monitoring system.

Observer Certification
Certified and trained human observer or in-stack opacity monitoring system that complies with test methods

CARB certified and trained human observer or in-stack opacity monitoring system that complies with test methods


