Novel techniques are described for networked aggregation of distributed localized particulate air pollutant (LPAP) sensors. For example, a large number of sensors is distributed over a geographic region. Each sensor can detect local levels of one or more LPAPs, and can communicate the detected levels over one or more communications networks. A system can receive data samples for the LPAP levels from the sensors and can compute LPAP scores that are mapped to respective sub-regions of the geographic region. The computation can be a function of aggregating respective LPAP levels for at least those LPAP sensors in a particular sub-region of the geographic region, and also as a function of comparing the aggregation against an identified set of trigger thresholds for the LPAP of interest. In some cases, the computed and mapped LPAP scores can be output for display, for example, as a heat map, or the like.