A photographer has captured striking images of a cloud of pollen engulfing a city in the United States.
High levels of pollen have been recorded across the south-eastern United States but a particularly thick blanket was caught on camera in Durham, North Carolina, by Jeremy Gilchrist.
He told CNN he had slightly altered the contrast of the images but they were otherwise untouched.
Dr Heather Gutekunst, from Allergy Partners of Raleigh, said that, while it looked dramatic, the visible pollen was probably not what was causing the most difficulty.
“The smaller pollen that’s invisible to the naked eye tends to be more of a trigger for the immune response than the larger pollen that we can see.”