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1. People used to think it was a romantic sight, seeing the buildings in the outcrops sticking out like needles from a layer of dark air until they discovered that it wasn't fog.

2.   With residents of both major cities in the country realizing that the air they breathe in is unhealthy, and that they are helpless in changing it, they are devising ways to coexist with it.

3. Sales of air purifiers at some stores in Ho Chi Minh City jumped 200% last month.

4. Some choose to commute to work by bus, and some try to avoid rush hour travel to get the most out of the air.

5. She did not want her son to breathe in this kind of air," Hung told VnExpress International as he waited for his friend at the university gate, wearing a mask.

6. In May 2019, a survey conducted by market research firm Indochina Research showed that air pollution is one of the top concerns of people in Hanoi and Ho Chi Minh City.

7.   The WHO considers air pollution to be the most prominent societal health risk of recent times.

8. It is estimated that more than 7 million people die each year as a result of air pollution, more than smoking, hunger and natural disasters combined.

9. They believe that the smog in Saigon is made up of condensate air pollutants caused by humidity and high temperatures.

10. On September 27, Hanoi (again) topped the world's worst air quality city in a ranking of more than 10,000 cities worldwide, with an AQI of 175.