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Una torre che aspira l'aria inquinata delle città e la rimanda fuori ripulita dalle polveri sottili. E’ l'invenzione di un imprenditore olandese, Daan Roosegaarde, di cui scrive il quotidiano britannico Guardian.
Un prototipo di sette metri è già stato costruito a Rotterdam ed è in grado di purificare l'aria di un parco cittadino. Secondo l'inventore, la tecnologia è stata acquistata anche dal comune di Pechino, una delle città più inquinate al mondo.
Lo smog a Pechino
La “
smog-free tower”, come è stata chiamata, funziona come un
gigantesco aspirapolvere, risucchiando fino a
30'000 metri cubi di aria all'ora. All'interno, campi di elettricità statica attraggono e imprigionano le polveri sottili come Ph2.5 e Ph10, le più dannose per la salute, prodotte dagli impianti di riscaldamento e dalle automobili (in Cina anche dalle centrali elettriche a carbone). L'aria rimandata all'esterno risulta
più pulita del 75% di quella aspirata.
ATS/ludoC
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