(CNN) — It’s raining plastic — that’s what a survey of rainfall in Denver and Boulder, Colorado, concluded recently. Researchers found plastic showed up in 90% of the samples, mostly in fiber form, and came in a variety of colors. Blue was most prevalent, followed by red, silver, purple, green, yellow and other colors, the study says.

The rainfall survey, titled “It is raining plastic,” was put together by scientists at the US Department of the Interior and US Geological Survey. It’s unclear where the plastic is coming from, but plastic contamination has been a growing problem throughout the world.

Scientists have found microplastic particles in rain before. They saw it in the rain falling in the Pyrenees in southern France. It has wound up in remote and otherwise pristine islands. Trillions of pieces of plastic litter float through the ocean, killing fish and other animals. An earlier study found that people are swallowing an average of 5 grams of plastic every week, about the weight of a credit card.

Volunteers of the NGO ‘Canarias Libre de Plasticos’ (Canary Islands free of plastics) carry out a collection of microplastics and mesoplastic debris to clean the Almaciga Beach, on the north coast of the Canary Island of Tenerife, on July 14, 2018. (credit: DESIREE MARTIN/AFP/Getty Images)

It’s unclear what the health effects of living with all this plastic will be, scientists say, although several studies are underway.

“According to the United Nations Environment Programme (UNEP), at current rates of pollution, there will likely be more plastic in the sea than fish by 2050.  It is estimated that about eight million metric tons of plastic find their way into the world’s oceans every year,” Getty Images Europe reported. “Once in the Ocean plastic can take hundreds of years to degrade, all the while breaking down into smaller and smaller ‘microplastics,’ which can be consumed by marine animals, and find their way into the human food chain.”

This illustration shows a selection of plastics that were found on May 26, 2019, within a few metres on Mothecombe Beach at the mouth of the Erme Estuary in South Devon. At a glance Mothecombe, appears a spotless white sandy beach, but looking closely reveals a plethora of degraded micro plastic detritus woven into and buried beneath the seaweed, an important feeding ground for wading birds. (Photo by Dan Kitwood/Getty Images)

Some cities have tried to cut back on plastic by banning plastic bags. Boulder, one of the sites for the rain survey, has a plastic bag ban.

(credit: Ina Fassbender/picture alliance/Getty Images)

While some companies have made it a goal to scale back their use of plastic, President Donald Trump Tuesday made an appearance at a Pennsylvania plastic manufacturing plant to promote plastic. When asked by a reporter about how he felt about the world being “awash in plastic,” the president blamed China for the problem.

“Well, we have tremendous plastics coming over from Asia, from China, and various others,” Trump said. “It’s not our plastic. It’s plastic that’s floating over in the ocean and the various oceans from other places. No, plastics are fine, but you have to know what to do with them. But other countries are not taking care of their plastic use and they haven’t for a long time. And the plastic that we’re getting is floating across the ocean from other places, including China.”

(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. CNN contributed to this report.)

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