Retrofit systems

Retrofitting devices have existed for almost two decades now, diesel particulate filter (DPF) technology being the dominant technology in retrofitting for some years.  Today, however the main concern is the NOx emissions. The annual threshold values set for nitrogen dioxides (NO2) (40 μg/m3) in the EU directive on ambient air quality have been exceeded in many busy roadside areas in large cities over several years; therefore, actions to reduce NOx are now being implemented in many cities and countries.

For NOx reduction, SCR technology has been successfully used in OE applications, and the same technology has also proven to be efficient and reliable in retrofitting. SCR combined with DPF is the most efficient combination in the retrofitting market, significantly reducing both PM and NOx, and markedly improving air quality in the short term.

Reduction technologies

Proventia provides retrofit systems based on diesel oxidation catalyst (DOC) technology, diesel particulate filter (DPF) technology, selective catalytic reduction technology (SCR) and combinations of the these three technologies.

Targeted pollutant
Reduction technology
Proventia product
Emission reduction %
PM + NOx
Urban driving
>90 % NOx reduction
>90% PM reduction
PM + NOx DPF + SCR NOxBUSTER® DPF + SCR >90 % NOx reduction
>90% PM reduction
NOx SCR NOxBUSTER® SCR > 90% NOx reduction
PM DPF PROAIR® DPF > 90% PM reduction
CO and HC DOC PROCAT™ DOC >90% CO reduction
>90% HC reduction

Proven results

Proventia´s proven results from global retrofit projects make us the leader in the market. We have supplied retrofit devices for a number of air quality projects worldwide including various mobile source applications e.g.  mining and materials handling and construction machines, as well as on-road vehicles like trucks and buses. Our diesel retrofit technologies have proven their ability to significantly reduce unwanted emissions at a reasonable cost.


NOxBUSTER for city driving
NOxBUSTER Installation
NOxBUSTER City upgrades up to Euro 6
NOxBUSTER® City produces the highest reduction rates in real urban driving and cold weather conditions, cold-start phases included.

Read more about NOxBUSTER City


NOxBUSTER system
NOxBUSTER system layout
NOxBUSTER® systems are a quick and cost-effective way to bring your vehicles up to date in terms of exhaust emissions.

Read more about NOxBUSTER


PROAIR Flex DPF system
PROAIR Muffler Replacement DPF
Proventia´s PROAIR® DPF systems are passively regenerating filters for retrofit installations. Retrofitting your machine or vehicle with a PROAIR® diesel particulate filter is a cost-effective way of making your vehicle compliant with emission regulations that demand low PM emissions

Read more about PROAIR DPF


PROCAT DOC for Bobtail TRU
PROCAT DOC for heavy-duty machine
PROCAT™ systems are based on diesel oxidation catalyst technology that reduces effectively hydrocarbon (HC) and carbon monoxide (CO) emissions

Read more about PROCAT DOC

PROCARE Drive real-driving monitoring

Emission tracking
Location tracking
For real-time NOx monitoring, we have developed the Proventia PROCARE™ Drive system. It is a web-based tool for monitoring vehicles´ exhaust aftertreatment systems and especially SCR and NOx reduction performance.

Read more about PROCARE Drive real-driving monitoring