Year-over-year total releases
Reported on-site TRI releases in pounds, grouped by reporting year.
Facility detail
COBURN OPTICAL INDUSTRIES
1701 S CHEROKEE, MUSKOGEE, OK, 74403
Parent company: PILKINGTON HOLDINGS INC
Carcinogen
— EPA classifications across all reporting years
Top chemical totals
The 10 chemicals with the highest cumulative on-site releases across all available years.
Full release table
Rows are years. Columns show the five highest-total chemicals across all years plus each year's total release volume.
| Year | Methyl ethyl ketone | Dichloromethane | 1,1,1-Trichloroethane | Manganese | Total |
|---|---|---|---|---|---|
| 1990 | 15,977 | — | — | 255 | 16,232 |
| 1989 | 15,060 | 6,000 | — | — | 21,060 |
| 1988 | — | 6,600 | 9,400 | — | 16,000 |
| 1987 | — | 6,000 | — | — | 6,000 |