Table 5.
Differences between EC and TEM GM concentrations by sample type and industry.
| Sample | Industry | EC differencesa | TEM differencesa |
|---|---|---|---|
| PBZ Resp. | Primary manufacturer | A | — |
| Hybrid producer/user | B | — | |
| Secondary manufacturer—electronics | B | — | |
| Secondary manufacturer—composites | B | — | |
| PBZ Inhal. | Primary manufacturer | A | A |
| Hybrid producer/user | B | A | |
| Secondary manufacturer—electronics | A | B | |
| Secondary manufacturer—composites | B | A | |
| AS Resp. | Primary manufacturer | A | — |
| Hybrid producer/user | A | — | |
| Secondary manufacturer—electronics | A | — | |
| Secondary manufacturer—composites | A | — | |
| AS Inhal. | Primary manufacturer | A | A |
| Hybrid- producer/user | B | A | |
| Secondary manufacturer—electronics | A,C | B | |
| Secondary manufacturer—composites | C | A |
AS, area sample; Resp., respirable size fraction; Inhal., inhalable size fraction.
aGM PBZ and area sample concentrations with the same letter are not significantly different in a Tukey multiple comparison ANOVA procedure with a level of significance of 0.05 for each sample type.