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PM2.5 generally declined following implementation of new US Environmental Protection Agency standards in 1997 [ 17, 29], yet since that time studies have shown elevated health risks due to long-term exposures to the 1997 PM threshold concentrations [ 29, 30].
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Yet even since that time species could in principle have had several opportunities to disperse through the Arctic.
Yet since the time of Eve losing mankind's innocence, they seem to have taken on great symbolic value.
Since standard chemotherapy was not yet established at that time, she chose the radiotherapy.
Authorities have remained tight-lipped since that time and have yet to comment on the teen's arrest.
Yet that time has passed.
Yet, as much as it pains me to admit it, little has changed since that time.
Since that time.
A lot has happened since that time.
since that time, she said.
Since that time it has split opinion.
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