A technology company has enlisted the help of 10 pigeons to monitor the air quality over London, according to the BBC.

The birds — racing pigeons with their own veterinarian in case they have trouble — have been outfitted by the firm Plume Labs with lightweight, GPS-enabled air monitors.

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The monitors track such items as ozone, nitrogen dioxide, and volatile compounds. The results are fed to the @PigeonAir Twitter account. Through Wednesday, March 15, users can tweet their location to the account and learn about pollution levels in their immediate area.

Meanwhile, live maps on a special website devoted to the pigeons’ efforts shows the birds’ flight paths.

The initiative comes thanks to a winning entry in Twitter’s “powered by Tweets” competition, and its aim is to draw attention to air pollution across London, which kills more than 9,000 people per year, according to The Guardian.