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