Since early 2019, Hanoi occurred 4 waves of air pollution: <br>Phase 1 lasts 16 days (from 11/1 to 26/1): In particular, the index at the highest stations Pham Van Dong in the station and reach over 140. <br>Phase 2 lasts 17 days (from 11/3 to 27/3): in particular, the index at the highest stations Pham Van Dong in stations and reaches 140. <br>Phase 3 lasts 27 days (from 12/9 to 3/10): in particular, the index in the galaxy's best noicao stations and reaches over 100. <br>as a rule, a good indicator is 0-50; Average 51-100; 101-150 less.
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