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Table 1 The mean annual concentrations of pollutants in the study period during 2014–2017

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

  1. 1μg/m3
  2. 2ppb
  3. 3ppm