由于车辆和建筑排放的 PM2.5 浓度很高，越南首都河内被列为世界上污染最严重的城市。 Hanoi, Vietnam's capital, is ranked as the world's most polluted city due to high PM2.5 levels from vehicle and construction emissions.

根据 AirVisual 的数据，越南首都河内被列为世界上污染最严重的城市，PM2.5 水平达到每立方米 187 微克。 Vietnam's capital, Hanoi, is ranked as the most polluted city in the world with PM2.5 levels reaching 187 micrograms per cubic metre, according to AirVisual. 高水平的车辆排放和与建筑相关的细尘导致了烟雾，损害了居民的健康。 High levels of vehicle emissions and construction-linked fine dust are causing the smog, damaging residents' health. 河内800万辆登记车辆造成了空气颗粒物污染的30%，工业排放占另外30%。 Hanoi's 8 million registered vehicles contribute to 30% of air particulate pollution, and industry emissions make up another 30%.