We are planning a trip to Vietnam in March but I've read there is a "burn season", and that it's necessary to wear masks. Has anyone experienced this at any time?
Thanks
You can make a reference on weatherspark site.
What parts of Vietnam do you plan to visit in March?
Where exactly? It's a very big country.
Burn season occurs during the dry season in the central highland mountains approximately from Mar through Apr. Most tourists don’t visit this part of Vietnam. To learn more about the provinces where this is practiced click on this link: https://en.wikipedia.org/wiki/Central_Highlands_(Vietnam).