Assessing the Applicability of Photocatalytic-Concrete Blocks in Reducing the Concentration of Ambient NO₂ of Chandigarh, India, Using Box–Behnken Response Surface Design Technique: A Holistic Sustainable Development Approach

Table 4

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

S. no.	Control parameters	Symbolic representation	Units	Maximum values for responses
				% degradation of NO2 (Y1 = 68.32%)
				Coded values	Actual values
1	Concentration of TiO2	X1	g	+0.175	3.35
2	UV-A irradiance	X2	mW/cm^2	+1.00	5
3	Relative humidity	X3	%	+0.82	64.60