Methods, systems, and apparatus, including computer programs encoded on computer storage media, for integrating a monitoring system with one or more air quality sensors. The method includes obtaining a request that includes an indication of an appearance of an object, selecting a first set of images in an initial modality based on the indication of the appearance of the object, determining an additional set of images in a different modality based on mappings between the first set of images and the additional set of images; and providing the first set of images and the additional set of images in response to the request.