Which innovative building material, introduced in the early 2000s, revolutionized facade design by allowing architects to create self-cleaning buildings that also break down air pollutants?

The architecture industry constantly evolves through innovative materials that reshape how buildings are designed and constructed. Some product innovations have dramatically transformed the field, allowing for previously impossible structures. This trivia question tests your knowledge about a revolutionary material innovation that changed modern architectural possibilities. Can you identify which material breakthrough had the most significant impact on contemporary building design?

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Photocatalytic titanium dioxide coating
Electrochromic smart glass
Cross-laminated timber (CLT)
Aerogel insulation panels