Dutch designer Daan Roosegaarde has covered advertising billboards in Monterrey, Mexico in an air-purifying resin that can eat up the city's smog.
The billboard advertisements are coated with a special resin that, when hit by sunlight, prompts a photocatalytic process to turn smog into clean air.
"This project proposes to take advantage of existing city panoramic structures to clean up polluting particles through an intelligent coating process that involves sunlight and wind," Studio Roosegaarde told Dezeen.
"It offers an additional alternative solution to mitigate air pollution and generate a real impact."

The photocatalytic process is similar to photosynthesis in which plants convert carbon dioxide and water into food. Furniture brand IKEA also used a photocatalyst mineral in its air-purifying Gunrid curtain. In Roosegaarde's project, a material called Pollu-Mesh is activated by natural light and used to separate oxygen from carbon dioxide.
"The smog-eating billboard uses a nanotechnology coating that is activated with sunlight, making a photocatalysis process in which, when in contact with the contaminating particles, it neutralises them, releasing oxygen," the studio added.
Pollu-Mesh is Roosegaarde's latest effort to tackle pollution in cities, following on from a series of smog-eating towers installed in Rotterdam and Beijing.
Monterrey is very susceptible to smog ? it has limited space for trees and is situated in a valley surrounded by...