aqi index

Why is the air in Hanoi unusually polluted this morning?
On the morning of January 14, Hanoi recorded the most polluted air in weeks. AQI is purple (AQI is over 200, very bad level).
Air quality in the North is maintained at an average level
Cloudy area in Hanoi, no rain, early in the morning with fog and light fog, afternoon noon sun. Southeast wind level 2-3, early morning and cold night.
Why does air pollution occur when people are sleeping?
Experts explain that Hanoi has a higher air pollution index at night, mainly due to the heat and calm winds that make it difficult for the air to diffuse to rise.
The truth about air quality indicators is that many of us are still mistaken
How to know the air you are breathing is clean, quality? In fact, we used to rely on our own feelings.
The truth from the atmosphere we still breathe every day
Recent figures show that Hanoi is more polluted than Beijing.
Beijing issued a red alert for the second time because of air pollution
People in northern China, especially the capital of Beijing, are about to catch a haze of dangerous smog over the weekend.