A study published on Thursday revealed the persistent presence of fentanyl and methamphetamine on public transit in Portland and Seattle.

The six-month study conducted by the University of Washington equipped buses and trains with air monitors to measure fentanyl and meth levels on transit lines, according to a report.

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Meth was discovered on 98% of surface samples and 100% of air samples, while fentanyl had measurements of 46% and 25%, respectively, the report noted.

"While the presence of drugs in a public place may initially seem alarming, we would like to try to put this data in perspective," a joint statement from the Oregon and Washington Poison Centers reads.

"Exposures to the quantities of drug demonstrated in this study are too small to produce physical effects from a shortterm exposure that a rider would experience. Therefore, individuals who use public transportation for travel needs should continue to feel safe doing so."

With that said, the statement recognized that the study highlights an epidemic of opioid and stimulant use across the Pacific Northwest and the nation.

"They did identify meth and fentanyl," Robert Hendrickson of the OSHU said. "They identified it in extremely small quantities but it’s still there."

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In Portland, 11 TriMet trains were examined throughout a two-day period in June, according to the report.

"We at TriMet are in support of limiting and eliminating all public consumption of drugs in public spaces," Andrew Wilson, the executive director of safety and security at TriMet, said.