Longitudinal study of respiratory function and symptoms in a non-smoking group of long-term officially-acknowledged victims of pollution-related illness

Table 1 Time required for certification of pollution-related illness

Illness	a)	b)	c)
Chronic bronchitis	24 months	48 months	36 months
Asthma	12 months	30 months	18 months
Emphysema	36 months	66 months	52 months

a) Individual who resided in a designated area prior to 1973.
b) Individual who did not reside in a designated area, but spent at least 8 hours per day in a designated area.
c) Individual who resided in a designated area, then relocated but continued to work in a designated area for at least 8 hours per day.

ISSN: 1471-2458