Measurements of SHS concentrations indicated by PM2.5 in restaurants and bars in some Chinese cities, µg/m3.

Note: SD standard deviation.a indoor PM2.5 concentrations were reported, not adjusted by outdoor PM2.5 concentrations;b 18 restaurants with interventions on training venue staff how to implement smoke-free policies, and the other 16 venues without any interventions.c 5 restaurants and 15 entertainment venues.