yesterday (observation)	currently (observation)	today (forecast)	tomorrow (forecast)
Belgium	- -9999	fairly good - 4	fairly good - 4	fairly good - 4
Flanders	- -9999	- -9999	moderate - 5	good - 3
Brussels	very bad - 9	moderate - 5	fairly good - 4	good - 3
Wallonia	moderate - 5	good - 3	moderate - 5	fairly good - 4