yesterday (observation)	currently (observation)	today (forecast)	tomorrow (forecast)
Belgium	fairly good - 4	good - 3	very good - 2	good - 3
Flanders	moderate - 5	fairly good - 4	very good - 2	good - 3
Brussels	fairly good - 4	good - 3	very good - 2	good - 3
Wallonia	very good - 2	very good - 2	very good - 2	very good - 2