Table 1-Mean±SD PM2.5 and CO levels
| Mean PM2.5±SD (mcg/m3) | Mean CO ± SD (ppm) | ||||||
| WCDC | WODC | WODO | WCDC | WODC | WODO | ||
| Brand1 | 1031±0.58 | 510±0.51 | 84±0.035 | 5.2±3.20 | 1.2±2.38 | 0.0±0.00 | |
| Brand2 | 848±0.62 | 467±0.51 | 61±0.031 | 4.7±2.94 | 1.5±2.41 | 0.0±0.09 | |
| Brand3 | 355±0.17 | 170±0.14 | 62±0.010 | 6.5±3.7 | 1.9±2.58 | 0.0±0.00 | |