: The AQI calculation for the Hanoi CEM Station are set back to normal levels while being fixed by the Hanoi EPA team.: AQI Station from UNIS (United Nations International School Of Hanoi) is now available for Hanoi.: The readings for the Hanoi CEM Station are abnormally low, so the PM2.5 AQI calculation has been again re-adjusted by a factor of 30 to reflect the current conditions.: Due to many message received about the Hanoi monitoring station is reporting abnormally low values (since December 21th, 2015), the AQI calculation for Hanoi is adjusted to reflect the current conditions. Check this blog entry for more information about this case.