About roadside API and general API (10點)

The General API reflects the level of air pollution which you are exposed to most of the time. It comes from measurements at 11 general air quality monitoring stations of the Environmental Protection Department.

On the other hand, the Roadside API tells you the level of air pollution at the roadside with very heavy traffic and tall surrounding buildings. There are altogether three roadside air quality monitoring stations.

So the difference of General API and Roadside API is General API only tells you about the level of air pollution which exposed to most of the time,and Roadside API tells the level of air pollution at the roadside with very heavy traffic and tall surrounding buildings.