Bettair is a hard-tech company focused on helping citizens and governments to monitor the air quality of urban areas, thanks to the Bettair IoT platform, which permits the mapping of air pollution at an unimaginable scale based on a large deployment of accurate gas sensors powered by Machine Learning techniques. The platform includes the sensor network, software for cities, an APP for citizens that provide real-time high-resolution air pollution heatmaps generated by using numerical models and machine learning. The platform assists cities to quantify pollution sources, enabling the assessment of the impact and effects of applied environmental actions to identify the most effective ones.