The Portuguese environmental agency is
Agência Portuguesa do Ambiente (APA)
https://www.apambiente.pt/
The Portuguese for "air" is "ar", the air quality measurement is called QualAR.
Air Quality Map
There's a map at
https://qualar.apambiente.pt/indices
You can also download a QualAR app for iOS or Android.
Of note, in addition to PM2.5 pollution from wildfires, Portugal also gets PM10 pollution from sand dust blown in from the Sahara.
Data
Data can be downloaded from
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