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A campaign demanding action on air pollution lets London residents discover just how toxic the air around their home is.

The Central Office of Public Interest (COPI) has launched a citizen-funded tool that rates pollution levels by address, through a system similar to the energy ratings that homes are given. At AddressPollution.org, users can enter their postcode and get a free report on the annual average levels of pollution there, along with any associated health or financial costs. The campaign kicked off by projecting air quality ratings onto homes and includes billboards that targets some of London's wealthiest areas. COPI is also contacting estate agents, urging them to be transparent about air quality with prospective homebuyers and renters. The work was written by Ben Polkinghorne and art directed by Scott Kelly.