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Located at the base of the bronchial tubes, these are microscopic yet number around 480 million in the average adult human. These are the tiny sacs in the lungs that receive the oxygen you breathe in.
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These fine particulates (PM2.5) are particularly harmful to health as they penetrate deep inside the lung tissue and are small enough to lodge in the alveoli. When looking at these figures it shows that for the rest of the year, over 10 million people were exposed to this polluted air. Ho Chi Minh City was a little better at having enjoyed only 36 days below the national average. There were 8 days when Hanoi registered a measurement of less than the national average of 50 µg/m 3 (micrograms per cubic metre) in 2019. One of the worst pollutants for human health is fine particulate matter (PM2.5). Ho Chi Minh City which is a large city in the south ranked as the cleanest with a US AQI figure of 79.
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Meanwhile, Hanoi which is the capital city in the north ranked amongst the top 15 most polluted cities in South East Asia, according to the IQAir AirVisual 2019 World Air Quality Report, with a US AQI figure of 129. From 2017 to 2018, the annual average concentration of PM2.5 (fine particulate matter) within Ho Chi Minh City rose from 23.6 to 26.9 micrograms per cubic meter (µg/m³). Vietnam is suffering from some of the worst air pollution recorded.
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