Geometric mean outdoor and indoor PM2.5 levels (μg/m3) in venues with different smoking policies
| Complete bans | Partial bans | No bans | Total | |||||||||
| n | PM2.5 level | n | PM2.5 level | n | PM2.5 level | n | PM2.5 level | |||||
| Outdoor | Indoor | Outdoor | Indoor | Outdoor | Indoor | Outdoor | Indoor | |||||
| Beijing | 7 | 120 | 102 | 2 | 89 | 93 | 76 | 126 | 248 | 85 | 124 | 225 |
| Wuhan | 2 | 64 | 54 | 4 | 46 | 55 | 73 | 47 | 169 | 79 | 48 | 155 |
| Xi'an | 8 | 163 | 130 | 1 | 146 | 159 | 72 | 194 | 361 | 81 | 190 | 323 |
| Kunming | 3 | 26 | 19 | 2 | 32 | 162 | 74 | 32 | 94 | 79 | 32 | 90 |
| Guiyang | 3 | 110 | 106 | 0 | – | – | 77 | 74 | 163 | 80 | 75 | 160 |
| Total | 23 | 103 | 85 | 9 | 56 | 89 | 372 | 77 | 187 | 404 | 78 | 176 |