# Upgrade (U4) to the CAMS European air quality forecasts

**URL:** <https://forum.ecmwf.int/t/upgrade-u4-to-the-cams-european-air-quality-forecasts/1015>\
**Category:** CAMS - Announcements\
**Tags:** cams, european\_forecast\
**Created:** [8 June 2021 11:20 UTC](https://forum.ecmwf.int/t/upgrade-u4-to-the-cams-european-air-quality-forecasts/1015 "2021-06-08T11:20:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Michela](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/898d66/32.png) [@Michela](https://forum.ecmwf.int/u/Michela)\
**Post date:** [8 June 2021 11:20 UTC](https://forum.ecmwf.int/t/upgrade-u4-to-the-cams-european-air-quality-forecasts/1015/1 "2021-06-08T11:20:38Z")

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We would like to inform you that the latest upgrade (U4) to the CAMS European air quality forecasts model has been implemented.   
 The main features introduced in the upgrade include:  
 1)Implementation of CAMS-REG emission including condensable PM (REF2) based on the reference year 2017.

2)Deletion and replacement of PM2.5 elemental carbon species.  
 The following parameters have been deleted:  
 Particulate matter d \< 2.5 µm - anthropogenic fossil fuel carbon only  
 Particulate matter d \< 2.5 µm - anthropogenic wood burning carbon only  
 The following two species have been added as replacements:  
 Particulate matter d \< 2.5 µm - anthropogenic total carbon only  
 Particulate matter d \< 2.5 µm - anthropogenic residential carbon only

3) Addition of Mugwort pollen for surface NRT forecasts.  
 The new source term consists of the addition in one parameter of 5 different Mugwort pollens, which cannot be clearly differentiated by observations.

Please see&nbsp;[CAMS Regional: European air quality analysis and forecast](https://confluence.ecmwf.int/display/CKB/CAMS+Regional%3A+European+air+quality+analysis+and+forecast+data+documentation)&nbsp;for documentation  
 For any questions, please raise a query at the [ECMWF Support Portal](https://confluence.ecmwf.int/site/support).

Your sincerely,

ECMWF User Support