Two types of community epidemiological studies (involving measures of short-term and long-term exposures and response) have been used to estimate PM/ mortality relationships.
All studies have shows that a PM rate of 5 poses little risk to humans.
mnli hypothesis: All studies have shows that a PM rate of 5 poses little risk to humans. premise: Two types of community epidemiological studies (involving measures of short-term and long-term exposures and response) have been used to estimate PM/ mortality relationships.