Seasonal Pollen Patterns Across the US
If you're bothered by seasonal nasal allergies, you're probably reacting to pollens or mold spores in the air. An estimated 35 million Americans are allergic to these airborne allergens.
There is a predictable pattern to pollen release:
Spring
In the first weeks of spring, trees such as elm, maple, and birch release their pollen; followed by ash, sycamore and oak.
Late Spring/Summer
Later in the spring and summer, grass pollens spread into the air, often starting in early May and lasting through mid-July. Various weeds also begin to pollinate in the spring (such as sage) or summer (such as plantain).
Late Summer/Fall
In late summer and fall, most weeds (like ragweed) produce their pollen, a process that may continue until the first frost.
Year-round
Molds are usually present in the fall, when leaves are decaying. However, they can cause problems year-round-whenever and wherever conditions are damp or humid.
Interactive Map: Pollen Seasons by Region

Click on any region of the map to learn which pollens are active in that region and when these pollens are typically at their peak. About a month before pollens you react to are active in your area, ask your doctor if NASONEX® may be able to help.
Preparing for Seasonal Nasal Allergies
If you are 12 years or older, you can help prevent most seasonal nasal allergy symptoms with NASONEX®, if you begin treatment 2 to 4 weeks before pollen season is expected in your area.
Important Safety Information About
NASONEX®
Side effects were generally mild and included headache, viral infection,
sore throat, nosebleeds, and coughing.
For additional important product information, see the NASONEX® Prescribing Information.
Sign up to receive Pollen and Weather Alerts and stay on top of pollen conditions in your area.
For the treatment of seasonal and perennial nasal allergy symptoms...
NASONEX® is a prescription nasal allergy spray approved for the treatment of seasonal and perennial nasal allergy symptoms in adults and children 2 years of age and older. Taken just once a day as directed by your doctor, NASONEX® helps relieve nasal allergy symptoms. These symptoms are itchy nose, runny nose, sneezing and congestion. NASONEX® helps by treating nasal allergy symptoms caused by dust mites, pet dander, even tree and grass pollen. Improvement can occur within 11 hours of initial treatment (based on studies done in a park during the pollen season and in a controlled pollen exposure room). The maximum benefit of NASONEX® is usually achieved within 1 to 2 weeks.
To help prevent most seasonal nasal allergy symptoms...
NASONEX® is the only prescription nasal spray clinically proven and FDA-approved to help prevent most seasonal nasal allergy symptoms in adults and children 12 years and older in addition to treating them once they occur. To help prevent most seasonal nasal allergy symptoms before they start, begin treatment 2 to 4 weeks before the anticipated start of the pollen season. It is important that you take NASONEX® regularly at the time recommended by your doctor, since its effectiveness depends on regular use.
And treatment of nasal polyps...
NASONEX® is proven effective to treat nasal polyps in patients 18 years and older.
Ask your doctor about NASONEX®
Talk to your doctor or health care professional to see whether NASONEX® is right for you or your child.
Important Safety Information About NASONEX®
Side effects were generally mild and included headache, viral infection, sore throat, nosebleeds, and coughing.
For additional important product information, see the NASONEX® Prescribing Information.
Available by prescription only.
You are encouraged to report negative side effects of prescription drugs to the FDA.
Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.
This site is intended for use by U.S. residents.
NASONEX is a registered trademark of Schering Corp., a subsidiary of Merck & Co., Inc.



