Weather cools in southern Vietnam, unseasonal rain in forecast
Average temperatures in the region will range from 22 to 34 degrees Celsius
Unseasonal rain results in smoggy sky in Ho Chi Minh City: expert
An increase in humidity has caused pollutants to remain longer in the atmosphere
Oxygen depletion, pollutants kill fish in iconic Ho Chi Minh City canal
Unseasonal rains washed toxic organic matter from nearby storm drains into the canal