A positive result for Vietnamese officials has recently been released, stating that Hanoi’s air pollution has seen reductions this year compared to previous years. Air pollution was considerably lower around the national holidays this year then it was in past years. 
Some places, particularly Pham Van Dong street, have seen in increase in air pollution this year, however. Pham Van Dong street is where CIAT offices are based and driving along this road is part of my daily commute. I can definitely confirm that air quality is poor in the area with large amounts of construction and roadworks taking place on a daily basis. A facemask is a must if one is to brave this street during rush hour.