Table 5. The lower limit ( $L_{\theta }$) and upper limit ( $U_{\theta }$) of the 95% confidence intervals for the percentile of the daily PM2.5 level data in Mae Hong Son and Lampang provinces.

Approaches	Mae Hong Son province		Lampang province
	$[L_{\theta },U_{\theta }]$	Interval length	$[L_{\theta },U_{\theta }]$	Interval length
GCI	$[27.8787,38.3599]$	10.4812	$[40.0647,49.7619]$	9.6972
Bootstrap	$[28.0199,38.1855]$	10.1656	$[40.0333,49.6188]$	9.5855
Bayesian	$[27.9843,37.7447]$	9.7604	$[40.5136,49.7726]$	9.2590
HPD	$[28.0339,37.7767]$	9.7428	$[40.4549,49.5468]$	9.0919