Provides an update on the international development of standards for ventilation. Covers ASHRAE Standard 62-1989R, the European Standard CEN prENV 1752, CIBSE Guide A sec2, DIN 1946 Part 2 and NKB-61 (Nordic Guideline). Compares the ventilation requirements in these proposed standards or guidelines. States although there are some differences in the scopes, all include a minimum ventilation rate which is the focus for comparison. Also reviews the definition of acceptable indoor air quality in the standards and procedures for estimating minimum ventilation.