More than 2,200 firefighters and more than 20 aircraft remain mobilised, supported by crews from across France and European partners. Firefighters battle a blaze in south-west France (Emma Da Silva/AP) (Emma Da Silva/AP Photo/Emma Da Silva)“We strike quickly and strike hard at any new smoke emissions,” Gironde fire commander Matthieu Jomain said. The extreme heat strips moisture from vegetation and drives humidity down, turning grasses, brush and forest litter into faster-burning fuel. That left Gironde as France’s biggest remaining wildfire battle interior minister Laurent Nunez said. A plane drops fire retardant over a forest in south-west France (Emma Da Silva/AP) (Emma Da Silva/AP Photo/Emma Da Silva)Smoke from the Gironde and Landes fires also triggered an ongoing particulate-pollution episode in both areas, regional air-quality monitors said.