Tourists get the majority of the benefit because residents of paris are smoking which is makes clear air not really a benifiet for them.

I thought the above needed a /s, but a check shows 30% of the people in France smoke. (I can't find city stastics)

i kinda seem to remember that this is a bit misleading and the rates are surprisingly different than expected. i'm too lazy to check the sources right now, but gemini gives me a 15% daily smoker rate for paris, while it's ~30% for detroit, 21% for philadelphia, 10% for new york, 5% for L.A.