Figure 7
Field measurements using the low-cost PM2.5 sensor in Jeju, Korea and Singapore: the field testing was conducted for seven and four months in Jeju and Singapore, respectively. The plots indicate ambient PM2.5 concentrations measured using the low-cost PM2.5 sensor compared to that from the reference station. (a) and (c) show raw data, (b) and (d) show RH-adjusted data using the visibility-derived mass growth. Visibility was predicted during the field measurement by the model proposed in the present study and used to correct PM2.5 concentration by the visibility-derived hygroscopic mass growth proposed by Molnár et al.59.
