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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