Table 3 Independent and dependent variables for GAMs.
Variables | UFB Model | UFD Model | UFCB Model | UFCD Model | |
|---|---|---|---|---|---|
Before lockdown | During lockdown | Before lockdown | During lockdown | ||
Independent variables | Industrial ED | ✓ | ✓ | ✓ | ✓ |
Public ED | ✓ | ✓ | ✓ | ✓ | |
Industrial LSI | ✓ | ✓ | ✓ | ✓ | |
Public LSI | ✓ | ✓ | ✓ | ✓ | |
Urban functional AI | ✓ | ✓ | ✓ | ✓ | |
Urban functional NP | ✓ | ✓ | ✓ | ✓ | |
Controlling variables | Population | ✓ | ✓ | ||
AQI | ✓ | ✓ | |||
PM2.5 (\({\upmu }\) g/m3) | ✓ | ✓ | |||
PM10 (\({\upmu }\) g/m3) | ✓ | ✓ | |||
O3 (\({\upmu }\) g/m3) | ✓ | ✓ | |||
CO (mg/m3) | ✓ | ✓ | |||
SO2 (\({\upmu }\) g/m3) | ✓ | ✓ | |||
Temperature (°C) | ✓ | ✓ | |||
Humidity (%) | ✓ | ✓ | |||
Wind speed (m/s) | ✓ | ✓ | |||
Dependent variables | NO2 variation | ✓ | ✓ | ✓ | ✓ |
