Air quality on the morning of October 21: Hanoi and Ho Chi Minh City are at an average level

With an AQI of 56 and 75, the yellow 'moderate' color, Hanoi and Ho Chi Minh City ranked 48th and 24th respectively in the list of 126 polluted cities in the world.

Hanoi's air quality is average.

According to the IQAir air monitoring system, at 7:30 a.m. on October 21, 2025, the air in both Hanoi and Ho Chi Minh City was at the "moderate" yellow level.

Specifically, with AQI index at 56 and 75, Hanoi and Ho Chi Minh City ranked 48th and 24th respectively in the list of 126 polluted cities in the world .

In Hanoi, the measuring station in Hoang Mai ward recorded the highest AQI index, at 90, yellow "moderate."

This figure will vary by time and time zone, as other cities around the world enter their peak hours and traffic and manufacturing activity peaks.

Also at this time, the two cities with the best air quality in the list of 126 locations monitored by IQAir are Vancouver and Toronto (Canada) with a green "Good" level of 15.

In Vietnam, according to VN Air - an application providing information on air quality on smartphones, the most polluted area in the country as of 7:30 a.m. on October 21 was in Pleiku ward (Gia Lai) with an AQI index of 117, orange "not good for sensitive groups."

Also according to VN Air, the best air quality index in the country belongs to Duyen Hai ward (Vinh Long) with a green air quality index, at level 5 - Good.

The Department of Environment recommends that people regularly monitor air quality to proactively limit the impact caused by air pollution.

The Department of Health Environment Management (Ministry of Health) recommends that when the air quality index is at a very bad level (201-300), normal people should avoid outdoor activities for long periods of time or participate in strenuous physical activities; encourage indoor activities; and avoid activities in areas with a high risk of air pollution.

If you have to work in areas with a high risk of pollution, you should use masks that can prevent fine dust; if you have to participate in traffic, you should increase the use of public transport and limit the use of motorbikes and bicycles to reduce exposure to polluted air.

Limit opening windows and doors during times of heavy air pollution; clean your nose and gargle with saline morning and night, especially after going out; wash your eyes with saline in the evening before going to bed.

For sensitive people, it is necessary to avoid all outdoor activities, switch to indoor activities or postpone to another day when the air quality index is better.

According to VNA

Source: https://baohaiphong.vn/tinh-hinh-khong-khi-sang-21-10-ha-noi-va-thanh-pho-ho-chi-minh-o-muc-trung-binh-524158.html