Valley Air District will perform scheduled system maintenance beginning at 6 PM on 6/29/2026. Some services may be temporarily unavailable for several hours.
Areawide Inventory
Areawide source emissions are from sources that are not regulated by the District, or are individually so small that they may not be included in our survey system. These small sources may not individually emit significant amounts of pollutants, but when aggregated can make an appreciable contribution to the emission inventory. Examples of these area sources are residential water heating and use of paints, varnishes, and consumer products. Emissions from these sources are grouped into categories and are estimated based on a single calculation methodology.
Of the more than 500 areawide source categories established by the California Air Resources Board (CARB), the District is responsible for estimating emissions from approximately 100. Emissions for the remaining categories are estimated by either CARB or the Department of Pesticide Regulation (DPR). Below are links to the District's Area Source Methodologies organized by emissions source categories.
Cogeneration |
|
020 – COGENERATION - NG20-995-0012-0000 COGENERATION Cogeneration 01/01/0001 |
|
Oil and Gas Production (Combustion) |
|
030 – FUEL COMBUSTION OIL & GAS PRODUCTION
30-040-0100-0000 PETROLEUM PRODUCTION FUEL COMBUSTION - GASEOUS FUEL30-040-1000-0000 PETROLEUM PRODUCTION FUEL COMBUSTION - LIQUID FUEL Oil and Gas Production (Combustion) 01/01/0001 |
|
050 - INDUSTRIAL FUEL COMBUSTION50-040-0012-0000 INDUSTRIAL STATIONARY I.C. ENGINES - OTHER FUEL50-040-1200-0000 INDUSTRIAL STATIONARY I.C. ENGINES - DIESEL/DISTILLATE Oil and Gas Production (Combustion) 01/01/0001 |
|
050 – INDUSTRIAL NATURAL GAS COMBUSTION50-040-0110-0000 INDUSTRIAL STATIONARY I.C. ENGINES - NATURAL GAS Oil and Gas Production (Combustion) 01/01/0001 |
|
Areawide Inventory - Fuel Combustion - Manufacturing and Industrial |
|
050 – INDUSTRIAL NATURAL GAS COMBUSTION50-995-0110-0000 INDUSTRIAL NATURAL GAS COMBUSTION (UNSPECIFIED) Areawide Inventory - Fuel Combustion - Manufacturing and Industrial 01/01/0001 |
|
050 - INDUSTRIAL FUEL COMBUSTION (DISTILLATE, RESIDUAL, AND LPG)50-995-0120-0000 INDUSTRIAL L.P.G. COMBUSTION Areawide Inventory - Fuel Combustion - Manufacturing and Industrial 01/01/0001 |
|
Areawide Inventory - Fuel Combustion - Food and Agricultural Processing |
|
052 – ORCHARD HEATERS52-995-1000-0000 ORCHARD HEATERS - LIQUID FUEL Areawide Inventory - Fuel Combustion - Food and Agricultural Processing 01/01/0001 |
|
Fuel Combustion - Service and Commercial |
|
060 - COMMERCIAL NATURAL GAS COMBUSTION60-020-0110-0000 COMMERCIAL NATURAL GAS COMBUSTION - SPACE HEATING60-030-0110-0000 COMMERCIAL NATURAL GAS COMBUSTION - WATER HEATING 60-995-0110-0000 COMMERCIAL NATURAL GAS COMBUSTION - OTHER Fuel Combustion - Service and Commercial 01/01/0001 |
|
060 – COMMERICAL DISTILLATE OIL, RESIDUAL OIL, AND LPG COMBUSTION60-995-0120-0000 COMMERCIAL LPG COMBUSTION60-995-1220-0000 COMMERCIAL DISTILLATE OIL COMBUSTION 60-995-1500-0000 COMMERCIAL RESIDUAL OIL COMBUSTION Fuel Combustion - Service and Commercial 01/01/0001 |
|
Fuel Combustion - Other (Fuel Combustion) |
|
099 - RESOURCE RECOVERY99-080-0012-0000 RESOURCE RECOVERY Fuel Combustion - Other (Fuel Combustion) 01/01/0001 |
|
099 - UNSPECIFIED COMBUSTION SOURCES99-995-0012-0000 UNSPECIFIED COMBUSTION SOURCES Fuel Combustion - Other (Fuel Combustion) 01/01/0001 |
|
Waste Disposal - Landfills |
|
120 – LANDFILLS – MUNICIPAL SOLID WASTE DISPOSAL120-122-0242-0000 LANDFILLS - MUNICIPAL SOLID WASTE DISPOSAL (BIODEGRADATION) Waste Disposal - Landfills 01/01/0001 |
|
Waste Disposal - Other |
|
199 – COMPOSTING WASTE DISPOSAL199-170-0260-0000 COMPOSTING WASTE DISPOSAL Waste Disposal - Other 01/01/0001 |
|
199 – VOLATILE ORGANIC WASTE DISPOSAL - EVAPORATION199-190-0300-0000 VOLATILE ORGANIC WASTE DISPOSAL (EVAPORATION) Waste Disposal - Other 01/01/0001 |
|
199 – BIOLOGICAL WASTE DISPOSAL - UNSPECIFIED199-995-0260-0000 BIOLOGICAL WASTES (UNSPECIFIED) DISPOSAL Waste Disposal - Other 01/01/0001 |
|
Cleaning and Surface Coating - Coating and Related Process Solvents |
|
230 – INDUSTRIAL COATINGS AND RELATED SOLVENTS230-236-9000-0000 PLASTIC PARTS COATINGS230-237-9000-0000 SEMICONDUCTOR COATINGS 230-238-9000-0000 AIRCRAFT AND AEROSPACE COATINGS Cleaning and Surface Coating - Coating and Related Process Solvents 01/01/0001 |
|
Cleaning and Surface Coating - Printing |
|
240 – PRINTING240-995-8000-0000 PRINTING Cleaning and Surface Coating - Printing 01/01/0001 |
|
Petroleum Production and Marketing - Oil and Gas Production |
|
310 – OIL PRODUCTION FUGITIVE LOSSES310-300-1600-0000 OIL PRODUCTION FUGITIVE LOSSES - SUMPS AND PITS310-312-1600-0000 OIL PRODUCTION FUGITIVE LOSSES - WELL CELLARS Petroleum Production and Marketing - Oil and Gas Production 01/01/0001 |
|
Petroleum Production and Marketing - Natural Gas Transmission Losses |
|
330 - NATURAL GAS TRANSMISSION LOSSES330-318-0110-0000 PETROLEUM MARKETING - NATURAL GAS TRANSMISSION LOSSES Petroleum Production and Marketing - Natural Gas Transmission Losses 01/01/0001 |
|
Petroleum Production and Marketing - Bulk Gasoline/Storage Transfer |
|
330 - GASOLINE BULK PLANTS/TERMINALS -STORAGE & TRANSFER330-382-1100-0000 BULK PLANTS/TERMINALS - GASOLINE STORAGE - BREATHING LOSSES330-384-1100-0000 BULK PLANTS/TERMINALS - GASOLINE STORAGE - WORKING LOSSES 330-390-1100-0000 TANK CARS AND TRUCKS - WORKING LOSSES 330-995-1100-0000 BULK GASOLINE STORAGE & TRANSFER (UNSPECIFIED) Petroleum Production and Marketing - Bulk Gasoline/Storage Transfer 01/01/0001 |
|
Industrial Processes - Chemical |
|
410 – RUBBER, FIBERGLASS AND PLASTICS MANUFACTURING410-402-5062-0000 RUBBER AND RUBBER PRODUCTS MANUFACTURING410-403-5018-0000 FIBERGLASS AND FIBERGLASS PRODUCTS MANUFACTURING 410-404-5000-0000 PLASTICS AND PLASTIC PRODUCTS MANUFACTURING Industrial Processes - Chemical 01/01/0001 |
|
410 - Sodium Carbonate (Soda Ash) Production410-406-2048-0000 SODIUM CARBONATE (SODA ASH) PRODUCTION Industrial Processes - Chemical 01/01/0001 |
|
410 – OTHER (MISCELLANEOUS) CHEMICAL PROCESSES410-995-4999-0000 OTHER (MISCELLANEOUS) CHEMICAL PROCESSES Industrial Processes - Chemical 01/01/0001 |
|
Industrial Processes- Food and Agriculture |
|
420 – FOOD AND AGRICULTURE – WINE AND BRANDY AGING420-410-6090-0000 WINE AGING (BRANDY) Industrial Processes- Food and Agriculture 01/01/0001 |
|
420 – FOOD AND AGRICULTURE - BAKERIES420-412-6012-0000 BAKERIES Industrial Processes- Food and Agriculture 01/01/0001 |
|
420 – FOOD AND AGRICULTURE – BREWERIES420-414-6000-0000 BREWERIES Industrial Processes- Food and Agriculture 01/01/0001 |
|
420 – AGRICULTURAL CROPS AND PRODUCTS PROCESSING LOSSES420-418-6000-0000 AGRICULTURAL PRODUCTS PROCESSING LOSSES420-420-6000-0000 AGRICULTURAL CROP PROCESSING LOSSES Industrial Processes- Food and Agriculture 01/01/0001 |
|
Industrial Processes- Mineral Processes |
|
430 – SAND AND GRAVEL EXCAVATION AND PROCESSING GRINDING AND CRUSHING OF AGGREGATE430-422-7078-0000 SAND AND GRAVEL EXCAVATION AND PROCESSING430-426-7078-0000 GRINDING/CRUSHING OF AGGREGATES Industrial Processes- Mineral Processes 01/01/0001 |
|
430 – MINERAL PROCESSES – SURFACE BLASTING430-428-7000-0000 SURFACE BLASTING Industrial Processes- Mineral Processes 01/01/0001 |
|
430 – MINERAL PROCESSES – OTHER (MISCELLANEOUS)430-995-7000-0000 OTHER (MISCELLANEOUS) MINERAL PROCESSES Industrial Processes- Mineral Processes 01/01/0001 |
|
Industrial Processes- Wood and Paper |
|
450 – WOOD PROCESSING LOSSES450-995-0230-0000 WOOD PROCESSING LOSSES Industrial Processes- Wood and Paper 01/01/0001 |
|
Industrial Processes- Other (Industrial Processes) |
|
499 – OTHER (INDUSTRIAL PROCESSES)499-995-0000-0000 INDUSTRIAL PROCESS LOSSES (UNSPECIFIED MATERIAL)499-995-0010-0000 INDUSTRIAL EVAPORATION LOSSES (UNSPECIFIED) Industrial Processes- Other (Industrial Processes) 01/01/0001 |
|
Solvent Evaporation - Asphalt Paving/Roofing |
|
540 – ASPHALT PAVING540-560-0400-0000 ASPHALT PAVING - CUTBACK ASPHALT540-562-0400-0000 ASPHALT PAVING - ROAD OILS 540-564-0400-0000 ASPHALT PAVING - HOT-MIX ASPHALT 540-566-0400-0000 ASPHALT PAVING - EMULSIFIED ASPHALT 540-995-0400-0000 ASPHALT PAVING - OTHER Solvent Evaporation - Asphalt Paving/Roofing 01/01/0001 |
|
540 – ASPHALT ROOFING540-590-0400-0000 ASPHALT ROOFING OPERATIONS Solvent Evaporation - Asphalt Paving/Roofing 01/01/0001 |
|
Miscellaneous Processes - Residential Fuel Combustion |
|
610 – RESIDENTIAL WOOD COMBUSTION610-600-0230-0000 RESIDENTIAL WOOD COMBUSTION – WOOD STOVES610-602-0230-0000 RESIDENTIAL WOOD COMBUSTION – FIREPLACES 610-604-0230-0000 RESIDENTIAL WOOD COMBUSTION – UNSPECIFIED Miscellaneous Processes - Residential Fuel Combustion 01/01/0001 |
|
610 – RESIDENTIAL NATURAL GAS COMBUSTION610-606-0110-0000 RESIDENTIAL NATURAL GAS COMBUSTION - SPACE HEATING610-608-0110-0000 RESIDENTIAL NATURAL GAS COMBUSTION - WATER HEATING 610-610-0110-0000 RESIDENTIAL NATURAL GAS COMBUSTION - COOKING 610-995-0110-0000 RESIDENTIAL NATURAL GAS COMBUSTION - OTHER Miscellaneous Processes - Residential Fuel Combustion 01/01/0001 |
|
Miscellaneous Processes - Fugitive Windblown Dust |
|
650 - EXPOSED LAKE BEDS650-653-5400-0000 EXPOSED LAKE BEDS Miscellaneous Processes - Fugitive Windblown Dust 01/01/0001 |
|
Miscellaneous Processes - Managed Burning and Disposal |
|
670 - AGRICULTURAL BURNING670-660-0262-0000 AGRICULTURAL BURNING - PRUNINGS670-662-0262-0000 AGRICULTURAL BURNING - FIELD CROPS 670-668-0200-0000 AGRICULTURAL BURNING - WEED ABATEMENT Miscellaneous Processes - Managed Burning and Disposal 01/01/0001 |
|
670 – RANGE IMPROVEMENT670-664-0200-0000 AGRICULTURAL BURNING - RANGE IMPROVEMENT Miscellaneous Processes - Managed Burning and Disposal 01/01/0001 |
|
670 – NON-AGRICULTURAL OPEN BURNING670-670-0200-0000 NON-AGRICULTURAL OPEN BURNING Miscellaneous Processes - Managed Burning and Disposal 01/01/0001 |
|
670 - WASTE BURNING UNSPECIFIED670-995-0240-0000 WASTE BURNING (UNSPECIFIED) Miscellaneous Processes - Managed Burning and Disposal 01/01/0001 |
|
Miscellaneous Processes - Cooking |
|
690 – COMMERCIAL COOKING OPERATIONS690-680-6000-0000 COMMERCIAL CHARBROILING690-682-6000-0000 DEEP FAT FRYING 690-684-6000-0000 COOKING (UNSPECIFIED) Miscellaneous Processes - Cooking 01/01/0001 |
|
Miscellaneous Processes - Other (Miscellaneous Processes) |
|
699 – OTHER (MISCELLANEOUS PROCESSES)699-995-0000-0000 ALL OTHER UNSPECIFIED SOURCES Miscellaneous Processes - Other (Miscellaneous Processes) 01/01/0001 |
|
Miscellaneous Processes - Other Mobile |
|
810 - CIVILIAN AIRCRAFT810-810-1400-0000 Jet Aircraft - Commercial810-812-1400-0000 Jet Aircraft - Civil 810-802-1140-0000 Piston Aircraft - Commercial 810-804-1140-0000 Piston Aircraft - Civil 810-804-1140-0000 Agricultural Aircraft (Crop Dusting) Miscellaneous Processes - Other Mobile 01/01/0001 |
|
810 – MILITARY AIRCRAFT810-800-1140-0000 Piston Aircraft - Military810-808-1400-0000 Jet Aircraft - Military Miscellaneous Processes - Other Mobile 01/01/0001 |
|
If you have any questions concerning the area source emissions inventory, please contact the District by email at AQInventory@valleyair.org.
Resources
Developed and maintained by
Navigation