Table 1.

Eight-hour average PM concentrations in the air of six ceramic factories (A–F) from each department in Lampang Province, Thailand

Department in factory	Level of 8-h average PM (μg/m3)
	A	B	C	D	E	F
Kaolin preparation	52	–	127	–	71	100
Scraping	24	–	–	–	–	–
Coating	40	149	109	31	128	–
Raw material preparation	–	192	–	–	–	–
Shaping	–	144	171	43	523	121
Casting	–	125	132	48	–	–
Rinsing	–	93	–	37	–	–
Decorating	–	130	147	29	–	–
Biscuit	–	95	96	27	–	–
Quality control	–	107	–	–	–	–
Grading	–	159	–	53	120	195
Packaging	–	99	43	–	–	–
Hallways	–	181	73	–	–	91
Assembling	–	–	141	–	–	–
Painting	–	–	63	–	186	153
Firing	–	–	45	–	131	84
Stickering	–	–	110	27	–	–
Engineering	–	–	138	–	–	–
Stocking	–	–	–	4	–	–
Mean	38.66	134.00	107.30	33.22	193.16	124.00

PM size is approximately 2.5 μm. –: not determined