(Final Ruling)


Basic Catalyst & Housing

Engine TypeSourceStandard Per Final Ruling
Spark Ignited (SI)


2 Stroke Lean Burn

Area Source


Major Source (100‐500 HP)

Management Practices


225 ppmv CO

Spark Ignited (SI)


4 Stroke Lean Burn

Area / Major Sources (>500 HP)


Major Source (100‐500 HP)

47 ppmv CO or 93% Reduction


47 ppmv CO

Spark Ignited (SI)


4 Stroke Rich Burn

Area Source (>500 HP)


Major Source (100‐500 HP)

2.7 % ppmv CH2O or 76% CH2O Red.


10.3 ppmv CH2O

Compression Ignited (CI)


Non‐Emergency 100‐300 HP

Area and Major Sources230 ppmv CO
Compression Ignited (CI)


Non‐Emergency 301‐500 HP

Area and Major Sources49 ppmv CO or 70% CO Reduction
Compression Ignited (CI)


Non‐Emergency >501 HP

Area and Major Sources23 ppmv CO or 70% CO Reduction
Compression Ignited (CI)


Emergency

Area and Major SourcesManagement Practice

Get More Info

Catalyst Reaction on CI (diesel) Exhaust

CO = 95‐99% Reduction
HC = 80‐90% Reduction
PM = 70‐88% Reduction (95‐99% with CRT)

Catalyst Reaction on CI (diesel) Exhaust

CO = 95‐99% Reduction
HC = 80‐90% Reduction
PM = 70‐88% Reduction (95‐99% with CRT)