Figure 2
From: Population exposure to hazardous air quality due to the 2015 fires in Equatorial Asia

Observed and simulated particulate matter concentrations.
Observed (black) and simulated (red) (a) 30-minute [PM10] at the ground-based station of Pekanbaru (Fig. 1a), in Sumatra and (b) hourly [PM2.5] averaged over Singapore. Summary statistics of model skill in reproducing daily mean concentrations are also reported in terms of correlation coefficient (R) and Normalized Mean Bias Factor (NMBF)49.