Air qualityindex measurement systems from the General Department of Environment under theMinistry of Natural Resources and Environment and independent air qualitytrackers PAMAir and AirVisual reported similar results at the veryunhealthy purple level.
VN Air showedmany places in Hanoi reaching the red-warning level for air pollution with AQIof 151-193 at 8am on January 14.
AirVisualforecasts that the air quality in Hanoi will still be polluted thisweekend.
At 8am onJanuary 14, AQI was reported at 285, the purple level, which is very harmful tohealth. This index remained until 1pm.
PAM Airrecorded the AQI index in most areas of Hanoi was at red, purple, brown levelsat 8am on January 14. Sixteen stations showed brown level from 302 to 440.
These stationsinclude Dong Anh town in Dong Anh district, Tran Hung Dao in Son Tay township,Phu Dong in Ba Vi district, Le Quang Dao, Co Dong, Pam Farm-Van Con in HoaiDuc district, Hoa Lac high-tech innovation centre in Thạch That district, andsome stations in Hoan Kiem, Tay Ho, Dong Da and Thanh Xuan districts.
Air pollutants,including fine particulate matter PM2.5, were trapped near ground level,worsening the air quality in Hanoi and other northern provinces.
Residentsshould stay updated on the air quality and follow expert recommendations duringheavy air pollution, doctors said./.