WHITE PLAINS, N.Y. (CBSNewYork) – While the groundhog wipes sleep from his eyes, Spring is a little behind.

Maple, cedar and elm trees should have been pumping out pollen two to three weeks ago, but it has been cold.

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Dr. Leonard Bielory with Rutgers University and Robert Wood Johnson University Hospital says get ready for a pollen explosion.

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“Late release, overlapping and therefore much more intense, to the point where you may even see clouds of pollen being released over the next several weeks where there will be almost a green mist; a yellow green mist which you will say, ‘Gee, it looks a little fuzzy,’ and that’s actually the pollen being released and it will be quite intense,” he told WCBS 880’s Sean Adams.

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This year though bucks the trend. Dr. Bielory has been studying climate change and in recent years, his counts show pollen release staring earlier and lasting longer.