Lori Bongiorno

Why are seasonal allergies lasting longer?

Woman Sneezing / iStockPhoto

Each year it seems like seasonal allergy symptoms are getting worse and lasting for a longer stretch. Studies are beginning to show that this is not only true, but that global warming may be partially responsible. Here's why:

  • The pollen production season is getting longer. Rising temperatures are causing plants and trees to flower earlier each spring and this means that the spring pollen season starts sooner. Lab studies show that the ragweed pollen season (early fall) may also be extended.

    Pollen is hanging around longer, says Kim Knowlton at the Natural Resources Defense Council. Scientists wonder if it might also be triggering a stronger allergic response.


  • Increasing carbon dioxide concentrations and rising temperatures can cause pollen-bearing plants to produce more pollen. So far, laboratory studies have shown that climate change causes ragweed to grow faster, flower earlier, and produce more pollen. More studies are needed to see if this is true for other types of pollen.

In a nutshell, the pollen seasons are longer and more intense. There is concern that this is only going to get worse as higher carbon dioxide levels rise, says Knowlton, who reports that there could be a 320 percent increase in ragweed production by the end of the century.

What's more, climate change may also increase ozone pollution, which is linked to allergies and asthma. Sneezing and Wheezing, an NRDC report, outlines how people exposed to both ragweed and ozone are likely to become sicker than those who are exposed to just one of the pollutants.

Here's what you can do to:

  • Talk to your doctor about the best strategies and medications to alleviate your symptoms.

  • Keep pollen out of your home, particularly on high pollen days. Take shoes off at the door. Wash clothing after you've been outdoors. Wash your hair. Many cities have a pollen reporting system. Search online to see if yours does.

  • In the summer, check Air Now, to find out the ozone levels in your area. On high ozone days, it's best to exercise or let kids play outside early in the morning and late in the day.

If you're one of the 40 million Americans who suffer from seasonal allergies, this might be the extra motivation you need to cut back on driving, use less energy at home, or make other simple changes to impact climate change.


Environmental journalist Lori Bongiorno shares green-living tips and product reviews with Yahoo! Green's users. Send Lori a question or suggestion for potential use in a future column. Her book, Green Greener Greenest: A Practical Guide to Making Eco-smart Choices a Part of Your Life is available on Yahoo! Shopping and Amazon.com.

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comments from our community

Showing 1 - 15 of 16 comments

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  • Posted by milon.m Wed May 20, 2009 12:34pm PDT
    hi
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  • Posted by Taking Care Sun May 24, 2009 8:58am PDT
    A few years back I developed allergies were I never had before. At the same time I saw more pollen than ever before as well. I tried over the counter meds, but the side effects cause me to stop using them. As time went by I have become more immune. I also have become more health conscious as to food intake, vitamins, clean water, meditation, and exercise. Which I believe are contributing factors to helping the immune system fight off issue like allergies. I am not a doctor so don't take my input as advice, just simply sharing my experience. Have A Great Day!
    Report Abuse
  • Posted by angel Sun May 24, 2009 7:49pm PDT
    GREAT COMMENT WE KNOW BETTER NOW, THANKS,.!!!!!!!!!!!!!
    Report Abuse
  • Posted by pitcairnis Mon May 25, 2009 10:40pm PDT
    My allergies symptoms and duration have gone done over the years, not gotten worse. Some people will try to blame global warming for everything.
    Report Abuse
  • Posted by dinolan2001 Tue May 26, 2009 8:08pm PDT
    I have had allergies for over 40 years. I've had allergy shots and other treatments. Currently taking both prescription and OTC meds which are doing an excellent job of controlling my symptoms. However, I think this story is just a lot of nonsense. Where I live our climate has gotten cooler and our growing season shorter, meaning less pollen not more.
    Report Abuse
  • Posted by Candie Tue May 26, 2009 8:22pm PDT
    This is in response to "pitcairns". For the past few years I have noticed my allergies getting much worse. Come to Austin, Texas. We know for a fact that if the tempature stays warm in the winter and we don't have a winter freeze, the allergy problem worsens in the spring. You can't tell any of us that GLOBAL WARMING does not affect our health. Oh but it does, just like it has been changing our weather patterns and that includes where you live too.
    Report Abuse
  • Posted by samantham Tue May 26, 2009 10:45pm PDT
    I agree my allergies have calmed down over the past couple of years. Usually around spring time I would really be messed up. But last yr wasn't bad or this yr either. My allergies come and go but rarely have them anymore.
    Report Abuse
  • Posted by hossein Wed May 27, 2009 12:18am PDT
    tank for your comment ifeel great
    Report Abuse
  • Posted by PsiL Wed May 27, 2009 3:25am PDT
    Google the movie toxic skies starring Anne Heche. I am sure alot of the problems are related to the topic of the movie. In all stories there is a grain of truth.
    Report Abuse
  • Posted by JoeyY Wed May 27, 2009 3:37am PDT
    Let's say we sell an OTC or Rx drug to combat hay fever symptoms. Now, let's also say we've identified the vegetation that produces the most pollen and are able to genetically enhance its germanation cycle with artificial selection. If we ensure our newfound hybrid flowered friends are entered into the wild, we can bet it will continue to grow and spread on its own for years to come without further investment. This would mean steady profit growth at declining cost. Brilliant. We're all a bunch of suckers.
    Report Abuse
  • Posted by gavfistow Wed May 27, 2009 4:31am PDT
    "Taking Care" - regarding the comment you made, "helping the immune system fight off issue like allergies" isn't correct because it's your immune system over-reacting to the allegens which causes an immune system response such as sneezing, red eyes, running nose etc. Allergies simply show that your immune system works as far as I'm aware? I've had "hay fever" since I was 14 years old and absolutely nothing ever worked for me to the extent that it was worth taking. That's including steroid injections and a variety of prescribed and over the counter medication. The only drug I ever took that actually had a real effect was Benedryl - the effect was that it put me to sleep during lunch breaks so that was the end of that! I have recently had fantastic results with the Medisana Medinose Plus device. So much so, that I really can't believe that it's actually working for me!!!! The best way to combat allergies is to avoid the allergens where possible - for me that means not going jogging or cycling in the summer months but doing these activities indoors instead. I tend to travel frequently and I've also discovered that I don't get any allergies when living in a humid tropical climate! So, if you live in a temperate zone - move to the tropics and say goodbye to your allergies!
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  • Posted by Venny Wed May 27, 2009 5:23am PDT
    I've had allegies whiwh are now attacking my babies. They are normally worse like if i see adirty place, during coldness, and when a smell a smoke. As for my leg's eachy i tried to look for medical treatment till one Dr.told me to rest from treament and i just try to avoid places that are causing such,other Drs told me its ECZEMA. But all the same when it starts i scatch to death........
    Report Abuse
  • Posted by scooter69_76 Wed May 27, 2009 5:27am PDT
    burning gas is destroying the ozone, so i quit driving. then i lost my good paying job. using 'normal' light bulbs requires elecricity which, unless clean, is bad for the planet. so i turned off all my lights. then i stubbed my toe. and it hurt. then i heard that cow flatulence is also hurting our planet. boom, no more meat. then i got skinny. bad skinny. then i finally heard the truth of all truths.....that its rising CARBON DIOXIDE levels that are doing all the REAL damage. Of course i love my planet and all those that live in it so i took one for the team and just quit breathing!!! i wonder what happens next??????
    Report Abuse
  • Posted by paul d Wed May 27, 2009 5:28am PDT
    Gavin - I couldn't have said better myself; I have tried everything under the sun, from shots to OTC to chiropractic work to control my allergies. However nothing works except benedryl, which knocks me out. I have had recent success with these oral drops I found from an Allergist in NYC - but of course due to our geniuses running the health care system, there are not covered by insurance - brilliant, the one thing that’s works isn't covered. I'll look into in the Medisana Medinose device. Another technique I've had success with is simply snorting a little water in my nose, sounds gross and hurts a little bit but really does clean out all the allergens up there affecting you.
    Report Abuse
  • Posted by Clarisse Wed May 27, 2009 5:51am PDT
    i live in florida where humidity is quite high than other states (i assume) so i was surprised when my allergy started in the spring of 2008. first i had hives all over my body for three consecutive times and my allergist could not rule out what was in it that gave me hives. then i started my constant sneezing and runny nose....nose sprays and allergy medicines didnt work....only Zyrtec which makes me sleepy. but take it at night and you'll be fine during the day. been taking that for six months...and it seems working for me.
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