Reference flow: 1 kg of NO_x removed by photocatalytic surface coating	LCI phase	Concrete pavement element	Asphalt pavement
Materials and energy—inputs from techno sphere
Water, gram	Production	577	645
TiO₂, gram	Production	48	35
SiO₂ (binder), gram	Production	12	45
NH₃ (pH stabilizer), gram	Production	2.5	1.5
Energy consumption, Wh	Production	12	33
Plastic, HDPE, gram	Production	9	10
Emissions to air
NO_x, gram	Operation	−1000	−1000
SO_x, gram	Operation	−33	−33
Emission to surface water
${NO}_{3}^{-}$ , gram	Operation	1900	1900
Residues
Plastic, HDPE, to incineration, gram	End-of-life	9	10
Waste product, to sanitary landfill, gram	End-of-life	94	74