![](https://saigonnezumi.com/wp-content/uploads/2016/11/img_5192-1-618x420.png)
Well, with winter coming to Shanghai soon, I was warned that the pollution of the air will get worse. Though I am not in Shanghai now, the air is quite bad. I will probably need to wear my mask there when I return Sunday.
I brought some 3M PM2.5 masks for a friend. I will bring more and some air purifiers next month to Saigon.
![AQI for Saigon, Hanoi and Shanghai AQI for Saigon, Hanoi and Shanghai](http://saigonnezumi.com/wp-content/uploads/2016/11/img_5192.png)
Hanoi’s air is terrible.