Year-over-year total releases
Reported on-site TRI releases in pounds, grouped by reporting year.
Facility detail
ALLEGRO MICROSYSTEMS WG INC
3900 WELSH RD, WILLOW GROVE, PA, 190902995
Parent company: NA
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 | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Hydrogen fluoride | Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Phosphoric acid | Nitric acid | Total |
|---|---|---|---|---|---|---|
| 2001 | — | 255 | — | — | 255 | 510 |
| 2000 | — | 255 | — | — | 255 | 515 |
| 1999 | — | 255 | — | — | 255 | 515 |
| 1998 | — | 255 | — | 255 | 255 | 770 |
| 1997 | — | 255 | — | 255 | 255 | 765 |
| 1996 | — | 255 | — | 255 | — | 510 |
| 1995 | — | 255 | — | 255 | — | 510 |
| 1994 | 1,005 | 255 | 255 | 255 | — | 1,770 |
| 1993 | 755 | 255 | 1,000 | 255 | — | 2,265 |
| 1992 | 755 | 255 | 500 | — | — | 1,510 |
| 1991 | 755 | 255 | 255 | — | — | 1,265 |
| 1990 | 255 | 255 | 10 | — | — | 520 |
| 1989 | 500 | — | 500 | — | — | 1,000 |
| 1988 | 500 | 500 | — | — | — | 1,500 |
| 1987 | 500 | — | — | — | — | 500 |