Although the consistent advice from EPA's Science Advisory Board has been to model premature mortality associated with PM exposure as a non-threshold effect, that is, with harmful effects to exposed populations regardless of the absolute level of ambient PM concentrations, some analysts have hypothesized the presence of a threshold relationship.
The EPA's Science Advisory Board produces collects data on premature mortality rates.
No threshold relationship exists.
Do you think there's ever enough room?
This job is a walk in the park.
The artist was a hermit and a aesthetic, and thus owned no physical items.
Two people are talking to each other
The author is problematic.
I want to get to know you.