yesterday (observation)	currently (observation)	today (forecast)	tomorrow (forecast)
Belgium	very good - 2	very good - 2	very good - 2	good - 3
Flanders	very good - 2	very good - 2	very good - 2	good - 3
Brussels	very good - 2	very good - 2	very good - 2	fairly good - 4
Wallonia	very good - 2	very good - 2	good - 3	good - 3