How is the API Calculated and Reported?
We report the real-time general and
roadside APIs hourly. These indices are
calculated by comparing the measured
concentrations of the major air
pollutants with their respective health
related Air Quality Objectives (AQOs)
established under the Air Pollution
Control Ordinance. These pollutants are
nitrogen dioxide, sulphur dioxide,
ozone, carbon monoxide and respirable
suspended particulates. An index is
calculated for each of the five
pollutants and the highest index is
reported as the API of that hour. |
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to view the photo of monitoring station |
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