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The wet tissues pile up as pollen from trees swirls in the air, clogging noses and tickling eyes without relief. This is what parts of March, April and May are like for many Americans.

Some years are worse than others, and pollen forecasters try to keep the public up to date on how the season progresses.

So, how do we know when it's the "worst in years"?

There are no nationwide government pollen trackers, but private companies do monitoring. SDI Health LLC, the company that runs the popular Web site pollen.com, has 480 pollen monitoring stations in the United States, said Gerry Kress, the company's owner.

"We're forecasting a heavier season this year than last year," he said. Read full article »

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