Table 2.

Descriptive statistics of chemicals in CEHD and IMIS meeting the inclusion criteria.

Chemical agent	CEHD					IMIS
	Number of sampling results	Proportion of aggregated sampling results [median number of measurements per aggregated sampling result]a	ND (%)	Proportion of sampling results ≥ PEL (%)	Proportion of sampling results recorded into IMIS (%)	Number of exposure results
Organic solvents
Toluene	9030	72 [3]	10	1	53	22063
Xylene	7987	69 [3]	15	2	52	14366
2-butanone	3355	81 [4]	17	3	49	6892
Stoddard solvent	2734	70 [4]	33	0	54	3629
Acetone	2567	74 [4]	15	1	53	6086
Metals and their compounds
Lead, inorganic	48291	33 [2]	58	20	65	59700
Copper fume	33663	33 [2]	36	7	42	25697
Zinc oxide fume	33212	33 [2]	36	1	40	25023
Antimony	33137	33 [2]	95	0	29	13612
Chromium	33035	33 [2]	61	1	36	20208
Beryllium	32783	33 [2]	96	1	29	14478
Nickel	32641	33 [2]	75	1	33	18380
Iron oxide fume	32492	33 [2]	15	4	47	32145
Cobalt	32410	33 [2]	89	1	31	14985
Manganese fume	32283	33 [2]	36	0	40	24716
Cadmium fume	15869	36 [2]	88	1	33	10369
Cadmium dust	14193	33 [2]	81	5	5	3334
Arsenic	4364	39 [2]	52	11	27	3004
Chromic acid	2834	32 [2]	52	7	48	3928
Dust/fibers
PNOR (respirable dust)	23129	33 [2]	82	2	5	12092
Silica, quartz	12978	25 [2]	27	28	53	28172
PNOR (total dust)	12036	29 [2]	28	8	23	18980
Other
Styrene	3819	78 [4]	9	11	53	9152
4,4’-MDI	3058	53 [2]	65	12	59	4360

^aPercentage of aggregated sampling results and median number of individual CEHD measurements per aggregated TWA sampling result.