O3: Number of days with max. 8-h value above 120 µg/m³, mean value 2021-22-23

|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/1/images/5fab446dab1b0f0735200f4ec4ada917?.png?nolink}}|0-5 days|
|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/1/images/3fe60fb885a2c6cb668c0bdb42a2b1e0?.png?nolink}}|6-10 days|
|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/1/images/39d4afd92455e934e877509e8cb1d595?.png?nolink}}|11-18 days (18 days = target value 2030 Directve)|
|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/1/images/2195a6c392f0dfa7f2c78ecd65fe534e?.png?nolink}}|19-25 days (25 days = target value current Directive)|
|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/1/images/bbd927619a9db2dde3410c6fa76b0142?.png?nolink}}|>25 days|

Classification of location type
|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/0/images/ed3a980edd60a8d7c045410b275a51b9?.png?nolink}}|rural background|
|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/0/images/09fefd19ec7662f8db591e0169649917?.png?nolink}}|urban background|
|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/0/images/63239df97cb55a45ebf9d3d49f9f33be?.png?nolink}}|close to traffic|
|{{http://arcgis-portal.public.lu/server/rest/services/GR/air_quality_2023_legend/MapServer/0/images/7c71f775891df7659a2fb2566dd236e6?.png?nolink}}|industrial|