Table 4. Sample statistics for the daily PM2.5 level data in Mae Hong Son and Lampang provinces.

Statistics	Mae Hong Son province	Lampang province
Minimum	3.30	8.20
Mean	58.18	58.39
Maximum	321.00	211.00
$n$	181	181
$\hat{\alpha }$	1.25	0.78
$\hat{\beta }$	31.93	45.46
$\hat{\theta }$	31.93	45.46