The Swiss take the public in public transport to heart and have proposed a way to use buses to track air pollution.

As part of efforts to collect better information about the air quality of Zurich, Switzerland, researchers at the École Polytechnique Fédérale de Lausanne (EFPL) and the Eidgenössische Technische Hochschule (ETH) Zurich have developed OpenSense, a project that will help determine if infrastructures of public transportation such as buses, along with mobile phone networks can serve as fitting venues to monitor pollution. According to Treehugger, climate- and traffic-resistant sensors for vehicles and ways to use mobile phones to access the data collected by such sensors are now in development:

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