PlanetWatch is a French company situated in the Pays de Gex region, near the Swiss border, Geneva, and CERN. They utilize advanced technologies and community participation to enhance global environmental monitoring and safeguard public health.

Their primary focus is on air quality. They are establishing a worldwide network of outdoor air quality sensors and individuals who are passionate about the environment (PlanetWatchers). Some sensors are installed and managed by local residents, while others are deployed by PlanetWatch in collaboration with transport and telecommunications companies, local authorities, and more. This approach enables the rapid deployment of cost-effective, high-density air quality monitoring networks, addressing the data gap in government networks.