The EU Court of Justice has previously ruled against Portugal in November 2012 for excessively high PM10 levels in Lisbon and Porto for the period 2005 until 2007.
Varasemalt, 2012. aasta novembris on Euroopa Kohus langetanud Portugali vastu otsuse ülemäärase PM10 osakeste taseme kohta Lissabonis ja Portos ajavahemikus 2005–2007.