RSM-Based Optimization of the Parameters Affecting TiO₂-Mediated UV Photocatalysis of Vehicular Emissions in Enclosed Parking Garages

Table 3

Optimum conditions for TiO₂-based UV photocatalytic degradation of the pollutants.

S. no.				Maximum values for responses
	Control parameters	Symbolic representation	Units	% degradation of NOx and SO2 ( & )
				Coded values	Actual values
1	Concentration of TiO2	X1	ml/m^2	+0.15	77.5
2	UV irradiance	X2	mW/cm^2	+1.00	5
3	Relative humidity	X3	%	+0.66	43.2