On September 15, Girona's low-emission zone (LEZ) will come into effect. The perimeter of the LEZ extends from Devesa Park to Carrer Emili Grahit, and from Carrer del Riu Güell to Carrer del Carme and the Barri Vell neighborhood. Entrances to the restricted area will be marked with signs, and photo surveillance cameras have also been installed. Restricted hours will be from 7 a.m. to 8 p.m., Monday through Friday. Outside of these hours, all vehicles may circulate without exception on weekends and midweek holidays. The LEZ control system in Girona uses 20 cameras located at 13 points along public roads in the city. These cameras take photographs of all vehicles that do not have an environmental sticker and that have not been previously authorized. The photographs of vehicles without an environmental sticker and unauthorized vehicles are sent to a database of the Barcelona Metropolitan Transport Authority (ATM), which performs two independent checks to ensure the license plate is correctly read.

Barcelona closes the first half of the year on the right track in terms of air pollution: nitrogen dioxide (NO₂) remain low after 2024 where historic lows were reached and the positive trend of recent years is confirmed. In fact, a decrease of between 2 and 14% is observed at the monitoring stations distributed throughout the city compared to the values from a year ago.