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Air quality
Eixample Station
- NO₂
  Moderated
- PM₁₀
  Very bad
Air quality
Poblenou Station
- NO₂
  Good
- PM₁₀
  Very bad
Air quality
Sants Station
- NO₂
  Good
Air quality
Gràcia Station
- NO₂
  Moderated
- PM₁₀
  Bad
Air quality
Ciutadella Station
- NO₂
  Moderated
Air quality
Vall d'Hebron Station
- NO₂
  Moderated
- PM₁₀
  Moderated
Air quality
Palau Reial Station
- NO₂
  Good
- PM₁₀
  Moderated