Take the following as truth: As stated in preamble to the 1997 PM National Ambient Air Quality Standards (40 CFR 50, 1997), the consistency of the results of the epidemiological studies from a large number of different locations and the coherent nature of the observed effects are suggestive of a likely causal role of ambient PM in contributing to the reported effects, which include premature mortality.
Then the following statement: "Ambient PM was not found to be a contributing factor." is true, false, or inconclusive?
Answer: False