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emilanes Apr 20, 2017 06:05 PM
Dear EEA Forum users,
EMEP/EEA air pollutant emission inventory guidebook 2016, 1.A.4 Non road mobile machinery 2016, Table 3-2 'Tier 2 emission factors for off-road machinery', notes that emission factors for LPG are not available at Tier 2 technology level and refers to Tier 1 emission factors, in this case, for all technology levels.
LPG emission factors for Tier 1 are shown in Table 3-1. E.g. 1.A.2.g.vii, 1.A.4.a.ii, 1.A.4.b.ii and 1.A.4.c.ii: NOx emission factor = 61093 g/tonnes fuel.
This value is higher than any NOx emission factor, at any technology level, for diesel fuel listed on Table 3-2 for NFR sectors 1.A.2.g.vii and 1.A.4.a.ii. E.g. 1991-Stage I NOx EF = 43552 g/tonnes fuel.
As one of the known benefits of LPG vs. diesel is a potential reduction of NOx emissions, is there any explanation to these differences?
Many thanks in advance for your help.
Replies (3)
EEA May 05, 2017 01:30 PM
Thanks for contacting The European Environment Agency.
We are working on getting a reply to your enquiry and will get back to you within the next days hopefully.

Kind regards
EEA May 15, 2017 11:00 AM

We are still waiting for an answer and we will inform you as soon as we know more.
Sorry about the waiting time.

Kind regards
EEA May 23, 2017 01:35 PM
After a review process NOx emission factor for both Tier 1 and Tier 3 for the LPG fuel have been updated. New values could be found at the EMEP/EEA Emission Inventory Guidebook 2016 version here: https://www.eea.europa.eu/[…]/emep-eea-guidebook-2016

Kind regards