Crit'Air
French air-quality vignette (sticker) required to enter ZFEs.
Official source: Certificat Qualité de l'Air (Crit'Air) — official FR gov →
French air-quality vignette (sticker) required to enter ZFEs. 6 categories from Crit'Air 0 (zero-emission) to Crit'Air 5 (most polluting). Mandatory in restricted zones.
Order online at certificat-air.gouv.fr — €3.81. Cannot be bought on the spot.
Sources
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