RICE‐NESHAP Emission Standards (Final Ruling)


Basic Catalyst & Housing

Engine Type Source Standard 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 Sources 230 ppmv CO
Compression Ignited (CI)


Non‐Emergency 301‐500 HP
Area and Major Sources 49 ppmv CO or 70% CO Reduction
Compression Ignited (CI)


Non‐Emergency >501 HP
Area and Major Sources 23 ppmv CO or 70% CO Reduction
Compression Ignited (CI)


Emergency
Area and Major Sources Management Practice

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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)