Air quality in some areas of Hanoi on January 8 was at unhealthy levels, prompting warnings for residents, especially the elderly, children, and those with underlying conditions such as cardiovascular or respiratory diseases, to limit outdoor activities, according to readings from Hanoi’s early air quality forecasting system (HanoiAir). HanoiAir is an early air quality forecasting system developed experimentally by the municipal Department of Agriculture and Environment in collaboration with the National Centre for Hydro-Meteorological Forecasting and the University of Engineering and Technology under the Vietnam National University – Hanoi (VNU-Hanoi). The system can forecast air quality trends over time and across locations, helping authorities guide and implement pollution control measures. In early January, Hanoi’s air quality has been deteriorating. Apart from providing information, Hanoi’s early air quality forecasting system serves as a tool to trigger concrete management actions.

Source: VietNamNet News January 09, 2026 04:30 UTC