Professor Paul Switzer’s Conclusions (Continued)
The issue of co-pollutant confounding has been given some attention but remains largely unresolved.
Incomplete characterization of the relations between ambient PM exposure, individual PM exposure, individual PM susceptibility to health effects, and community level health effect measures.
Enforced additivity in the analysis model.The analysis model assumes that the PM health effect is necessarily the same at any temperature, in every season, and at any level of the co-pollutants. Limited analyses show that this assumption is likely to be seriously violated.