Table 2.
Time-varying lockdown effects of NO2 and PM2.5 concentrations at the downtown, suburban and rural areas based on the scaling factors from GAM analysis. Scaling factors represent the percentage changes of concentrations in a certain period relative to the Pre-LD period.
| Region | NO2 |
PM2.5 |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| FEB (%) | MAR (%) | APR (%) | MAY (%) | JUN (%) | FEB (%) | MAR (%) | APR (%) | MAY (%) | JUN (%) | |
| Downtown | −39 | −29 | −23 | −15 | −11 | −47 | −51 | −16 | −30 | 1 |
| Suburban | −45 | −27 | −14 | −7 | −3 | −28 | −24 | 16 | −26 | 4 |
| Rural | −43 | −25 | −12 | −4 | −4 | −32 | −30 | 14 | −26 | −8 |