Dear Cậu,
One the biggest problems in my city is dust. There is so many dust everywhere that I cannot go out without a mask and glasses.
The main cause of this is the construction which is carried out throughout the city. You know, there is something under construction most of the time on most streets.
After local people's reports about the problem, the city have implemented many solution including sending more dustmen to clean streets, asking the construction sites to minimize the emission of dust by various methods.
We also join the dustmen in cleaning our surroundings at the weekend. I hope that the problem will not last long.
Write to me soon to talk about yours.