I don't know if there's an app, but you should be able to find a chart for your area. I took a picture of one that was on the wall at my allery doctor's office. I had allergy testing done in 2011 and now I'm undergoing allergy immunotherapy. I can't say enough good things about it. I've been symptom-free since I got on my maintenance dose. They test you for the allergens that you're allergic to and then mix a custom serum with everything you're allergic to. You then get a monthly injection of this serum over a three year period, which gradually makes you build up immunity. At the the end of the three years, your symptoms will be gone, or at least reduced by at least 70%, and you will no longer be allergic to the allergens that you once were.
This chart is for the western US:
This chart is for the western US:
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Pardon my forwardness here....Ill just put this out there not knowing any specifics and maybe being a better solution to an app...Raw organic honey, but must be locally produced (sold in your health food stores) that way your getting honey from flowers in your area. Studies show over time this has reduced or cured many allergies associated with pollen and plants by building up the bodies immunity.
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Here are the direct links to the apps that Napoleon PhoneApart found for you, superchaos
Pollen.com's Allergy Alert by SDI
https://itun.es/us/Me08y.i
WebMD Allergy by WebMD
https://itunes.apple.com/us/app/webmd-allergy/id588509171?mt=8
Incidentally, as I was going to secure these links to share them with you, I noticed the the Mac App Store, doesn't have a Share button to share a direct link to an app with a friend (via e-Mail, via iMessage, post to Twitter, etc.) Perhaps it's simply hidden in a conspicuous location and I couldn't find it (Anyone able to find it?)
I had to go get the links on my iPhone, and share them to myself via iMessage and copy and paste those links from Messages.app on OS X to be able to share with you... Unnecessary extra steps! If Apple provided the Share Link To App functionality on the OS X version of the App Store, everyone wins. The end users, and Apple.
iOS has this! Why not give it to OS X as well? It can only make it easier for users to spread links to apps, resulting in greater sales for the App Store.
Hopefully for OS X 10.9....
Pollen.com's Allergy Alert by SDI
https://itun.es/us/Me08y.i
WebMD Allergy by WebMD
https://itunes.apple.com/us/app/webmd-allergy/id588509171?mt=8
Incidentally, as I was going to secure these links to share them with you, I noticed the the Mac App Store, doesn't have a Share button to share a direct link to an app with a friend (via e-Mail, via iMessage, post to Twitter, etc.) Perhaps it's simply hidden in a conspicuous location and I couldn't find it (Anyone able to find it?)
I had to go get the links on my iPhone, and share them to myself via iMessage and copy and paste those links from Messages.app on OS X to be able to share with you... Unnecessary extra steps! If Apple provided the Share Link To App functionality on the OS X version of the App Store, everyone wins. The end users, and Apple.
iOS has this! Why not give it to OS X as well? It can only make it easier for users to spread links to apps, resulting in greater sales for the App Store.
Hopefully for OS X 10.9....
Whatever happened to just typing the names of the apps I provided into the App Store search box? You folks need to accept a few challenges. 
These apps won't really help. Treatment with immunotherapy or steroids or controlling the symptoms with antihistamines are the only things that will help. Just knowing the pollen levels never did me any good because avoiding exposure was impossible. One thing that can decrease the symptoms is to buy a new pillow every six months or always wash your hair right before bed. The pollen transfers from your hair to the pillow, which is why many people wake up with symptoms even though they aren't allergic to dust or any household allergens. Just washing the pillowcase is not enough.
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Zyrtec has an app:
https://itunes.apple.com/us/app/zyrtec-allergycast/id320298020?mt=8
Also, The Weather Channel app has a tab called "In Season":
https://itunes.apple.com/us/app/the-weather-channel/id295646461?mt=8
https://itunes.apple.com/us/app/zyrtec-allergycast/id320298020?mt=8
Also, The Weather Channel app has a tab called "In Season":
https://itunes.apple.com/us/app/the-weather-channel/id295646461?mt=8