In an effort to encourage bicycle use and simultaneously protest against Mexico City's continued pollution problem, four individuals took to the streets topless in a protest sponsored by children's rights groups. Covered only by the outlines of diseased organs, the riders seek to push the city towards moving the progress began in the mid-1990s to new levels.

Two men and two women rode topless down Mexico City’s main boulevard Wednesday to protest the health effects of the city’s ongoing pollution problem and encourage residents to use bicycles instead of cars.

The cyclists had painted their bodies with the outlines of diseased lungs and other internal organs they say are affected by car-caused pollution.

The protest was sponsored by children’s and bicycle rights groups.

The city has made progress since the mid-1990s, when air quality was unacceptable almost every day of the year.

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