This Year's Bay Area Pollen Season Is Really Bad. Here's Why

The Bay Area has gotten well and truly soaked this year, with some cities near or already surpassing their average rainfall for the entire water year.

But what’s good for our water supply can be a pain in the ear, nose and throat for allergy sufferers. All that rain means more plants growing, which also means more pollen, the fine powder produced by plants’ reproductive organs, called the stamen. Pollen is the cause of most seasonal allergies, and the pollen count indicates how much of it is floating around in the air.

“This pollen season was particularly bad because it rained so heavily and abruptly stopped, and everything pollinated,” said Dr. Michelle Huffaker, of the Allergy and Asthma Medical Group of the Bay Area. “We experienced an overlap between trees and grasses, with really high burdens of pollen each. That was particularly bad for folks’ symptoms.”

For the 7.8% of U.S. adults that suffer from hay fever, that means sneezing, congestion, watery eyes and general discomfort, according to the American Academy of Allergy, Asthma, and Immunology, not to mention legions of sneezing, congested, watery-eyed and generally discomforted sufferers.

Daniel Mackey, 56, a resident of San Francisco, has struggled with pollen allergies for 20 years. “I’ve never suffered as badly as I did this year,” Mackey said.

Ordinarily, he buys loads of antihistamine when his allergies act up, typically in April. That’s usually enough to keep his symptoms at bay.

“This year has been far more difficult,” he said. “It just makes your life unmanageable. It does seem to be getting increasingly worse each year, but this year was particularly bad.”

For children with difficult-to-control asthma or people that don’t have access to inhalers,  medication and other treatment, a bad reaction could mean a trip to the intensive care unit. Although rare, the most dire allergy attacks can be life-threatening.

Is Global Warming Making Your Allergies Worse?

Here’s the long-term outlook: Pollen season is starting earlier and lasting longer. That alone could spell trouble for allergy sufferers. But in addition, plants are producing more pollen, so not only is the season lengthening, it’s also more severe.

One reason for this unwelcome shift is that climate change is pushing temperatures higher, according to researcher Lewis Ziska, a plant physiologist with the U.S. Department of Agriculture’s research service.

“Bottom line, there is a clear effect of temperature increasing the length of the season but also increasing the intensity,” Ziska said.

The negative trend in pollen would seem to extend well beyond the Bay Area, according to a recently published retrospective study in Lancet Planet Health. The study, on which Ziska was the lead author, analyzed at least 20 years of pollen data from 17 locations across the Northern Hemisphere. Twelve of the 17 areas experienced increases in annual pollen count, and 11 of 17 endured a longer season.

Additionally, a 2014 study published in the journal PLOS One suggested that elevated levels of carbon dioxide can increase the amount of pollen some plants produce, by as much as 50% per flower.

The researchers, from Harvard and the University of Massachusetts, Amherst, estimated that grass pollen, the scourge of many Bay Area allergy suffers, will increase by up to 200%.

“We are concerned about the future; if we consistently see temperature changes, that [is] going to mean enormous consequences in terms of allergy season and for people’s health,” Ziska said.