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

Table 1

Three levels of the process parameters used during the optimization process.

S. no.			Units	Coded values
	Process parameters	Symbolic representation		−1 (low)	0 (medium)	+1 (high)
1	Concentration of TiO2		ml/m^2	20	70	120
2	UV irradiance		mW/cm^2	1	3	5
3	Relative humidity		%	10	30	50