The tower that clears smog and helps to make jewellery

Artist Daan Roosegaarde has been developing a giant ioniser which sucks up dirty air and emits clean air.

Using this process, the smog particles can be converted into jewellery - rewarding donors who have supported the project through crowdfunding.

BBC Click has spoken to Daan Roosegaarde about his latest piece of work which will debut in September.

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