From: Ambient particulate matter and biomass burning: an ecological time series study of respiratory and cardiovascular hospital visits in northern Thailand
PM101
NO22
O32
CO3
2014
45.6
7.2
24.2
0.59
2015
45.4
8.5
27.6
0.65
2016
44.7
7.7
24.9
0.55
2017
35.5
6.4
21.9
0.54