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