Table 2.

Land use regression model for annual average ozone concentration (ppb).

Variable	Regression Coefficient	p-Value	Partial R
Intercept	1.52	<0.01
NOx	−4.79 × 10−3	<0.01	0.54
Thermal power plant	−1.55 × 10−6	<0.01	0.08
All types of residential—25 m	−1.25 × 10−5	0.06	0.001
Relative humidity	−1.85 × 10−3	<0.01	0.02
Forest—500 m	1.15 × 10−7	<0.01	0.02
Altitude	1.03 × 10−4	<0.01	0.009
Distance to main road	9.64 × 10−6	<0.01	0.005
Purely residential—25 m	−3.25 × 10−6	0.13	0.004
Cemetery and crematorium—3000 m	−1.71 × 10−8	<0.01	0.004
Temple—500 m	−4.29 × 10−3	0.01	0.003
Temperature	9.05 × 10−3	<0.01	0.003
Non-irrigated crops—250 m	2.09 × 10−7	<0.01	0.002
Temple—1000 m	−4.13 × 10−4	0.05	0.001
Mixed residential area—25 m	−9.25 × 10−4	<0.01	0.04
Industrial area—5000 m	−1.44 × 10−9	<0.01	0.003

Model performance: overall model R² = 0.74; adjusted R² = 0.73; Root Mean Square Error (RMSE) = 0.04 ppb; 10-fold cross-validation R² = 0.70; externally validated R² = 0.39.