Preface -- Contents -- Summary -- 1 Introduction -- 2 Acetaldehyde -- 3 Hydrogen Chloride -- 4 Hydrogen Fluoride -- 5 Hydrogen Sulfide -- 6 Propylene Glycol Dinitrate -- Appendix A: Biographic Information on the Committee on Emergency and Continuous Exposure Guidance Levels for Selected Submarine Contaminants -- Appendix B: Statement of Task -- Glossary.