Table 2

Phases and indicators available during the study period. Barcelona, 1996–98

Phase 1Phase 2Phase 3Phase 4
June 1996Up to November 1997Up to June 1998Up to December 1998
Operational situation of the plants
Simultaneous unloadingXX
Restrictions on timetable and fluxXX
Meteorological restrictionsXXX
Installation of new filtersXX
Indicators available
Epidemic asthma outbreaksXXXX
Panel of patientsX
Allergen concentrationXXXX
Allergen emission levelsXX