There is a lack of precision in the definition of health, which leads to confusion
in the assessment of adverse effects arising from indoor air pollution. Adverse
health effects range from annoyance to life-threatening conditions. Survey
responses suggest that males and females differ in their perception of a healthy
person, but both sexes envisage a male in terms of positive fitness, strength,
energy and the possession of an athletic body, rather than how long one was
likely to live. Psychological fitness was relatively unimportant in describing
the health of others, but was rated as very important with respect to one’s own
health. Mortality statistics tend to obscure the proportion of the population
who suffer chronic illness that is not life threatening. Although health is largely
determined by genetic constitution, lifestyle and environmental factors, the
morale of an individual is also important. A new classification of the adverse
effects on health of indoor air pollution is proposed: this includes ‘comfort’
responses, such as sick building syndrome (category 1); acute biological effects,
including allergies and microbiological infections (category 2A); acute chemical
effects, the nature of which depends upon the specific intoxicant (category
2B), and perceived chronic grave risk, including cancer causation (category 3).
The magnitude of risk in this latter category is imprecise, because its measurement
involves the technique of quantitative risk assessment.