activities. There may be strong irritations and symptoms and this may trigger other illnesses. Elders and the
sick should remain indoor and avoid exercise. Healthy individuals should avoid outdoor activities.
Where does the outdoor Air Pollution Index come from?
The Air Pollution Index in China is provided by the Ministry of Environmental Protection of the People's
Republic of China. More information can be found
Air Quality (Hong Kong)
Air Quality (Hong Kong)
Outdoor Air Pollution Index (API)
The Outdoor Air Pollution Index (API) is displayed on the outdoor dashboard.
Complementary information
By touching on the "..." button in the air quality gauge, you can display complementary information (when
available): main pollutant, hour and location of the report.
API colors
This color code scale makes it easier for anyone to understand quickly whether the air is polluted.
Understanding the Air Pollution Index
The Air Pollution Index is divided into seven categories:
"Low" API is 0 - 25. No response action required.
"Medium" API is 26 - 50. No response action required.
"High" API is 51 - 100. No immediate response action is suggested. Long-term effects may, however, be
observed if exposed at such level persistently for months or years.
"Very High" API is 101 - 200. Persons with existing heart or respiratory illnesses, childrens and the elderly are
here.