Since the smoking bans in public places in 2007 and 2008, café and restaurant patios have become more widespread and are increasingly enclosed, especially in winter. The association "Les Droits des non-fumeurs" conducted air pollution measurements for fine particulate matter and carbon monoxide (CO) at 111 café and restaurant patios and inside these same establishments in eight cities across France in 2008. The measured CO levels remain low in all tested locations, with the exception of hookah bars. Particulate pollution on terraces ranged from 5,000 particles per cm³ (or 5 kpt/cm³) to 164 kpt/cm³, with an average of 58.7 kpt/cm³ if the terrace allowed smoking and 15.3 kpt/cm³ if it did not. Inside the establishments, pollution levels are nearly identical, although the smoking ban was observed during our measurements: 22.7 kpt/cm³ if the terrace is non-smoking and 60.0 kpt/cm³ if it accommodates at least one smoker. These measurements show that the configuration of the terrace—open-air (30.8 kpt/cm³), partially covered (55.4 kpt/cm³), or fully covered and enclosed by vertical partitions (113.6 kpt/cm³)—has a significant impact on the amount of pollutants in the ambient air, both on the terrace and inside the establishment. (R.A.)