is smog bad in hanoi vietnam, Why is Hanoi so polluted?

How is the city air quality in Hanoi, Vietnam?

Air pollution is a chief environmental concern for Hanoi, Vietnam, especially in certain seasons of the year. A combination of industrial growth, vehicle emission, and agricultural burn-off creates high levels of air pollution in the city. This may contribute to the development of health problems among residents, especially the ones suffering from respiratory diseases. Therefore, it is better to keep a tab on local air quality reports in order to take respective precautions, such as wearing a mask and avoiding excessive outdoor activities, when air quality reaches levels of concern.

Indeed, smog can be an issue in Hanoi, Vietnam, especially in the winter months of November to February. Air pollution airports and other pollution by factories and burning of agricultural products lead to visible haze, reduced visibility and health problems to residents and visitors alike. It’s always a good idea to consult local air quality indexes and reduce outdoor activity — including wearing masks — when pollution is high.

Hanoi ranks among the world’s most polluted cities for the highest concentration of particulate matter (PM2.5), microscopic particles that can penetrate deep into the lungs and cause respiratory problems such as difficulty breathing, coughing, wheezing and worsening asthma. As winter temperatures drop in Hanoi and outdoor activities are limited, the air is filled with toxic pollutants, most notably particulate matter from industrial areas and construction sites.