The Handbook of Emission Factors for Road Transport

We will implement an update of HBEFA 5.1 tonight, July 2, 2026.

In version 5.1.008 all emission factors for the subsegment TT/AT>7,5-14t Euro-7 have been corrected. This change is only relevant for Switzerlandand Norway, as these countries are the only ones that include this size classin their fleets. This change is also only relevant for emission factor resultsfor future years, as Euro 7 HGV only start entering the fleet in 2027.

Additionally, we would like to inform you that with the 5.1.007 update from May 28, 2026, we“accidentally” corrected an additional error that we only became aware of acouple of days ago:

The calibration factors that adjust PM-nonexhaust emission factors to levels consistent with immission measurements had yet not beenimplemented for HDV. PM-nonexhaust emission factors of HDV were therefore too high.

Re-running the import script for the Version update 5.1.007 (which already contained the implementation but apparently must have not run fully the last time it was executed) implemented the calibration factors and “accidentally” corrected this error.

You as a user are requested to re-query any HDV non-exhaust emission factors that you have queried prior to May 28, 2026.

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We will implement an update of HBEFA 5.1 tonight, May 28, 2026.

The following missing emission factors will be fixed:

·       non-regulated pollutants for CNG, FFV, LPG Euro-6 subsegments

·       PN23-ex for UBus HEV Euro V

·       Diesel minicars <250cc

·       CH4/NMHC for TT/AT 7.5-20t Euro VI DE

In addition, the default ambient condition pattern choice for API queries has been fixed, and in the Expert Version, the correct “idfq_scen” is written to the EMOD result metadata.

We will implement another update of HBEFA 5.1 today, Feb 25, 2026:

The mileage correction of air pollutants has not been working when querying emission factors for LDV (light duty vehicles) for individual traffic situations. This will be corrected with Version number 5.1.006.

We will carry out the update tonight, February 25, after 18:00 CET. The server ill be restarted. For users, the update will take effect with the next application restart.