Potentiated effects extra example: isopropanol exacerbates the effects of carbon terachloride Synergistic effects: smoking and radon lung cancer, Antagonistic effect examples used as treatments: oxygen for CO exposure, charcoal exposure for poison ingestions, chelation therapy
AIHA book on odor thresholds http://books.google.ca/books?id=Lh8nLs9ZuKwC&pg=PA4&lpg=PA4&dq=WARNING+PROPERTIES+OF+CHEMICALS&source=bl&ots=FWIZU7zazt&sig=e4Qe4XUGOaFAhQ-ZyHzBlp3hFcQ&hl=en&ei=ZBSWTaypHLLKiAKdm_2cCQ&sa=X&oi=book_result&ct=result&resnum=10&ved=0CEIQ6AEwCTgK#v=onepage&q=WARNING%20PROPERTIES%20OF%20CHEMICALS&f=false
They are the actual data points from human clinical or experimental animal studies.
Reversible – irritation, decreased enzyme production, asphyxiation Irreversible – scaring of tissues, cancer