Sensors that are down for maintenance are shown as grey flags.
With an average Q1 2017 AQI reading of 123 (Unhealthy for sensetive groups) the air quality in Hanoi is on the increase from the same period in 2016. However, we still had more than 50% of the days in the first quarter (37 out of 90 days) above the Vietnamese National Regulation of 50 μg/m3. In 2017 the peak air pollution in Hanoi was reached with 234 μg/m3 on the 15th of February at 11am.