The photocatalytic concrete developed by researchers at the Korea Institute of Civil Engineering and Building Technology (KICT) reduces levels of nitrogen oxides (NOx) by approximately 18% in road tunnels.
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.imeche.org/news/news-article/polluted-air-in-seoul-tunnel-cleaned-up-by-photocatalytic-concrete
Polluted air in Seoul tunnel cleaned up by photocatalytic concrete
www.imeche.org