Who has the worst air in the world?
10 view
1 answer
# Pollution
Which transportation pollutes the most?
18 view
1 answer
Why is air quality so bad in Hanoi?
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1 answer
Is Ho Chi Minh City polluted?
10 view
1 answer
Which mode of transport is least polluting?
9 view
1 answer
Which of these vehicles would cause the least pollution?
16 view
1 answer
Does Vietnam have poor air quality?
18 view
1 answer
What is the most polluting mode of transport?
20 view
1 answer
What city has the lowest air quality?
8 view
1 answer
What is the least polluted city in Vietnam?
95 view
1 answer