Table 1.

Typical characteristics of the mobile and non-mobile design classes of air pollution monitoring

Characteristics	Mobile design class	Non-mobile design class
Mounting platform	Motor vehicle, bicycle, or pedestrian	Trailer, telephone pole, rooftop, or tripod
Monitoring equipment	High-quality samplers	Costly and/or cost-effective devices including low cost sensors
Primary pollutants	UFP, BC, and gaseous pollutants	PM2.5 and gaseous pollutants
Spatial domain	One city at a time	Multiple cities at a time
Temporal domain	A few weeks to a few years	Multiple years
Spatio-temporal resolution of measurements	One or a few seconds on thousands of road segments or at hundreds of stops typically including repeat visits	More than ten fixed or rotating sites at the same time
Concurrent sampling	No	Yes
Prediction model domain	Spatial	Spatial or spatio-temporal