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['Air Programs']
['Air Programs', 'Mobile Emission Sources', 'Air Emissions', 'Air Permitting', 'Air Quality']
08/26/2026
Copyright 2026 J. J. Keller & Associate, Inc. For re-use options please contact copyright@jjkeller.com or call 800-558-5011.
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InstituteAir QualityAir EmissionsMobile Emission SourcesCAA ComplianceEnvironmentalFocus AreaAir PermittingUSAEnglishAnalysisAir ProgramsAir ProgramsIn Depth (Level 3)
Regulated mobile sources and fuels
['Air Programs']
- There are various mobile source sectors regulated by the EPA under the CAA.
| Aircraft | Commercial aircraft engines |
|---|---|
| Heavy-duty vehicles | Heavy trucks and buses: large pick-ups, delivery trucks, recreational vehicles, and semi-trucks |
| Light-duty vehicles | Passenger cars and light trucks: minivans, passenger vans, pickup trucks, and sport-utility vehicles |
| Locomotives | Diesel-powered engines used in freight and passenger rail, ling-haul and switch locomotives |
| Motorcycles | On-road 2- and 3-wheeled vehicles, mopeds, and scooters |
| Marine-compression ignition (CI) engines | Auxiliary and propulsion engines used by all types of recreations and commercial vessels: small fishing boats, tugboats, ocean-going ships. Marine auxiliary engines: small generator sets to larger generator sets on ocean-going vessels |
| Marine spark-ignition (SI) engines and vessels | Gasoline boats and personal watercraft: pleasure boats, jet-skis, outboard engines, and sterndrive/inboard engines |
| Nonroad CI engines and equipment | Construction and agricultural equipment: excavators, paving equipment, tractors, combines, bulldozers, and skidders |
| Nonroad large SI engines and equipment | Gasoline and propane industrial equipment: forklifts, generators, airport service equipment, compressors, and ice-grooming machines |
| Nonroad small SI engines and equipment | Small gasoline lawn and garden equipment: lawnmowers, leaf blowers, chain saws, and string trimmers |
| Recreational engines and vehicles | Land-based recreational vehicles: snowmobiles, dirt bikes, and all-terrain vehicles (ATVs) |
| Low sulfur gasoline | Established in conjunction with the Tier 2 light-duty vehicle standards to maintain the performance of catalytic converters. |
| Ultra-low sulfur diesel (ULSD) fuel | Covers highway, nonroad, locomotive, and marine diesel fuel. ULSD is necessary for new advanced emission control technologies, and it contributes to particulate matter reductions in the existing fleet of nonroad engines and equipment. |
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air-programs
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Regulated mobile sources and fuels
InstituteAir QualityAir EmissionsMobile Emission SourcesCAA ComplianceEnvironmentalFocus AreaAir PermittingUSAEnglishAnalysisAir ProgramsAir ProgramsIn Depth (Level 3)
['Air Programs']
- There are various mobile source sectors regulated by the EPA under the CAA.
| Aircraft | Commercial aircraft engines |
|---|---|
| Heavy-duty vehicles | Heavy trucks and buses: large pick-ups, delivery trucks, recreational vehicles, and semi-trucks |
| Light-duty vehicles | Passenger cars and light trucks: minivans, passenger vans, pickup trucks, and sport-utility vehicles |
| Locomotives | Diesel-powered engines used in freight and passenger rail, ling-haul and switch locomotives |
| Motorcycles | On-road 2- and 3-wheeled vehicles, mopeds, and scooters |
| Marine-compression ignition (CI) engines | Auxiliary and propulsion engines used by all types of recreations and commercial vessels: small fishing boats, tugboats, ocean-going ships. Marine auxiliary engines: small generator sets to larger generator sets on ocean-going vessels |
| Marine spark-ignition (SI) engines and vessels | Gasoline boats and personal watercraft: pleasure boats, jet-skis, outboard engines, and sterndrive/inboard engines |
| Nonroad CI engines and equipment | Construction and agricultural equipment: excavators, paving equipment, tractors, combines, bulldozers, and skidders |
| Nonroad large SI engines and equipment | Gasoline and propane industrial equipment: forklifts, generators, airport service equipment, compressors, and ice-grooming machines |
| Nonroad small SI engines and equipment | Small gasoline lawn and garden equipment: lawnmowers, leaf blowers, chain saws, and string trimmers |
| Recreational engines and vehicles | Land-based recreational vehicles: snowmobiles, dirt bikes, and all-terrain vehicles (ATVs) |
| Low sulfur gasoline | Established in conjunction with the Tier 2 light-duty vehicle standards to maintain the performance of catalytic converters. |
| Ultra-low sulfur diesel (ULSD) fuel | Covers highway, nonroad, locomotive, and marine diesel fuel. ULSD is necessary for new advanced emission control technologies, and it contributes to particulate matter reductions in the existing fleet of nonroad engines and equipment. |
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Copyright 2026 J. J. Keller & Associate, Inc. For re-use options please contact copyright@jjkeller.com or call 800-558-5011.