Emissions Analytics research exhibits GPFs make an enormous distinction

Emissions Analytics research exhibits GPFs make an enormous distinction


A latest research by main UK-based impartial emissions testing firm Emissions Analytics examined 4 apparently comparable pairs of gasoline-fueled autos between the US (with out gasoline particulate filters (GPFs)) and Europe (with GPFs). The US autos had been examined in Michigan, and the European autos within the UK. The autos had been:

  • 3.0l BMW X5 (MY 2019 in US, MY 2020 in UK)

  • 2.0l Jeep Wrangler (MY 2020 US and UK)

  • 2.5l Toyota RAV4 Hybrid (MY 2019 US and UK)

  • 1.5l Ford (MY 2020 Escape in US, MY 2020 Kuga in UK)

In every case, the European automobile was outfitted with a GPF, whereas the US automobile was not, because of present regulatory necessities.

Every automobile was then examined on comparable on-road routes within the two international locations to permit the comparability of their particle mass and quantity emissions. The gasoline emissions and particle quantity had been measured utilizing a regulatory-approved transportable emissions measurement system (PEMS) from Sensors, Inc, along with a diffusion charger for particle mass measurement.

Comparable on-road routes had been designed in each places, which, regardless of the inevitably completely different visitors and ambient circumstances, had been proven to have comparable dynamics general.


Common emissions throughout the 4 pairs of autos. Emissions Analytics.

Outcomes had been extremely constant between the 4 autos and between various kinds of driving, from city chilly begin to freeway heat begin.

The typical discount in particle quantity was 86% throughout the completely different autos and driving; the variation was from 76% to 96%. The equal general particle mass discount was 55%, with 81% on freeway.

A GPF system sometimes prices lower than $200, which is about the identical value because the non-obligatory carpet mats on the BMW X5. Subsequently, the associated fee for eradicating each billion particles emitted into the air is simply 0.0004 cents. Along with this, there may be the additional potential good thing about eradicating particles from the air which have come from different sources. As Emissions Analytics has proven … diesel particulate filters (DPFs) can ‘clear’ the air because the automobile drives. GPFs at the moment are attaining filtration effectivity charges—sometimes 80%, with the subsequent era of GPFs for Euro 7 rules more likely to exceed 95%—which are getting near these of DPFs, and so the identical net-cleaning impact may be anticipated. Furthermore, the filtration effectivity tends to enhance with the age of the filter, so the optimistic impact, if something, grows.

… whilst BEVs take off, there may be rising proof that they emit extra tire put on emissions that ICE autos because of their elevated weight. Emissions Analytics’ checks confirmed a 21% improve in tire particle mass emissions for 500 kg further automobile mass—roughly equal to the mass of a big battery pack—though this can be partially offset by the impact of regeneration breaking. Extra usually, there may be an on-going pattern in direction of heavier autos of all kinds, which will increase tire emissions. Regardless that solely 10-20% of tire put on emissions hold within the air, GPFs may have the additional benefit of eradicating these particles from the air. In different phrases, ‘legacy’ ICE autos may assist clear up emissions from BEVs.

—Emissions Analytics


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September 2022