yesterday (observation)	currently (observation)	today (forecast)	tomorrow (forecast)
Belgium	moderate - 5	moderate - 5	fairly good - 4	fairly good - 4
Flanders	moderate - 5	poor - 6	moderate - 5	fairly good - 4
Brussels	poor - 6	bad - 8	moderate - 5	fairly good - 4
Wallonia	fairly good - 4	fairly good - 4	fairly good - 4	fairly good - 4