Table 1. Daily counts of hospitalizations and outpatient visit for respiratory diseases and air pollution levels in China, 2013–2018.
| Variables | Mean (SD) |
| Abbreviations: SD=standard deviation; COPD=chronic obstructive pulmonary disease; PM2.5=particulate matter ≤2.5 m in diameter; PM10=particulate matter ≤10 m in diameter; SO2=sulfur dioxides; NO2=nitrogen dioxide; CO=carbon monoxide; O3=ozone. | |
| Outpatient visit (daily counts per county) | |
| COPD | 38 (18) |
| Asthma | 8 (5) |
| Hospitalizations (daily counts per county) | |
| COPD | 6 (4) |
| Asthma | 3 (2) |
| Pollutants | |
| PM2.5 (μg/m3) | 59.1 (43.4) |
| PM10 (μg/m3) | 95.9 (61.9) |
| O3 (μg/m3) | 112.8 (59.3) |
| SO2 (μg/m3) | 19.8.2 (17.2) |
| NO2 (μg/m3) | 47.9 (21.3) |
| CO (mg/m3) | 1.1 (0.7) |