Certificate numbers have been issued sequentially since 1960. The following table shows the years in which the noted certificate numbers were issued.
| Certified Industrial Hygienist |
| 1960 |
1 to 13 |
1961 |
14 to 40 |
| 1962 |
41 to 483 |
1963 |
484 to 525 |
| 1964 |
526 to 554 |
1965 |
555 to 572 |
| 1966 |
573 to 595 |
1967 |
596 to 609 |
| 1968 |
610 to 627 |
1969 |
628 to 647 |
| 1970 |
648 to 673 |
1971 |
674 to 694 |
| 1972 |
695 to 742 |
1973 |
743 to 808 |
| 1974 |
809 to 918 |
1975 |
919 to 1002 |
| 1976 |
1003 to 1125 |
1977 |
1126 to 1313 |
| 1978 |
1314 to 1521 |
1979 |
1522 to 1750 |
| 1980 |
1751 to 2007 |
1981 |
2008 to 2175 |
| 1982 |
2176 to 2479 |
1983 |
2480 to 2732 |
| 1984 |
2733 to 2956 |
1985 |
2957 to 3233 |
| 1986 |
3234 to 3528 |
1987 |
3529 to 3848 |
| 1988 |
3849 to 4171 |
1989 |
4172 to 4581 |
| 1990 |
4582 to 5090 |
1991 |
5091 to 5457 |
| 1992 |
5458 to 5870 |
1993 |
5871 to 6335 |
| 1994 |
6336 to 6720 |
1995 |
6721 to 7018 |
| 1996 |
7019 to 7284 |
1997 |
7285 to 7612 |
| 1998 |
7613 to 7822 |
1999 |
7823 to 7966 |
| 2000 |
7967 to 8084 |
2001 |
8085 to 8236 |
| 2002 |
8237 to 8464 |
2003 |
8466 to 8740 |
| 2004 |
8741 to 8903 |
2005 |
8904 to 9110 |
| 2006 |
9111 to 9268 |
2007 |
9269 to 9429 |
| 2008 |
9430 to 9567 |
2009 |
9568 to 9743 |
| 2010 |
9744 to 9898 |
2011 |
9899 to 10061 |
| 2012 |
10062 to 10265 |
|
|
| Certified Associate Industrial Hygienist |
| 2001 |
CAIH - 1 to 12 |
| 2002 |
CAIH 13 to 23 |
| 2003 |
CAIH 24-29 |
| 2004 |
CAIH 30-34 |
| 2005 |
CAIH 35-37 |
