yesterday (observation)	currently (observation)	today (forecast)	tomorrow (forecast)
Belgium	moderate - 5	fairly good - 4	good - 3	good - 3
Flanders	moderate - 5	fairly good - 4	fairly good - 4	good - 3
Brussels	poor - 6	moderate - 5	fairly good - 4	good - 3
Wallonia	good - 3	very good - 2	good - 3	good - 3