The submission of enquiries to the Forum is closed from July 6th to August 31st 2017. We look forward to receiving your enquiry in September. If your enquiry is related to the right of access to documents as outlined in Regulation 1049/2001 regarding public access to European Parliament, Council and Commission documents, please contact or see access to documents. We apologise for any inconvenience
Please login or register to participate.
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:[…]/emep-eea-guidebook-2016

Kind regards