New York Times JERSEY; A Little Pollen Goes a Long Way

NEWARK - THE state's premier pollen-counting site turns out to be a pretty small-scale operation. On a rooftop at the University of Medicine and Dentistry of New Jersey, overlooking downtown Newark and the Manhattan skyline beyond, a small beige box sits on a metal scaffold anchored by concrete blocks.

Every 10 minutes, its two little greased rods spin for 30 seconds. Like right now -- hear that whir?

"Just sampling the air," explains Dr. Leonard Bielory, who runs the allergy division here and is giving me a quick tour on a bright breezy afternoon. "The air floats by, the pollen sticks."

https://www.nytimes.com/2001/05/13/nyregion/briefing-the-outdoors-pollen-woes.html?searchResultPosition=2