HOLT CAT® offers on-road emissions reduction solutions at a wide variety of price points to address particulate matter and nitrogen oxides emissions.
From Johnson Matthey Inc.:
CRT® filter – Continuously Regenerating Technology
AdvCCRTTM filter – Advanced Catalyzed Continuously Regenerating Technology
SCRT® system – Selective Catalytic Reduction Technology
From additional major manufacturers:
Diesel Particulate Filters
Diesel Oxidation Catalysts