Seasonal allergic rhinitis (hay fever) affects more than 35 million Americans. If you suffer from it, you may experience sneezing, stuffiness, a runny nose and itchiness in your nose, the roof of your mouth, throat, eyes or ears. These allergic reactions are most commonly caused by pollen and mold spores in the air outside, which start a chain reaction in your immune system.
Pollen are tiny cells needed to fertilize plants. Pollen from plants with colorful flowers, like roses, usually does not cause allergies. These plants rely on insects to transport the pollen for fertilization. On the other hand, many plants have flowers which produce light, dry pollen that are easily spread by wind. These culprits cause allergy symptoms.
Each plant has a period of pollination that does not vary much from year to year. However, the weather can affect the amount of pollen in the air at any time. The pollinating season starts later in the spring the further north one goes. In most climates, the entire pollen season lasts from February or March through October. In warmer places, pollination can be year-round. In Austin, Mountain Cedar, which is highly allergenic, pollinates late October through early March.
Seasonal allergic rhinitis is often caused by tree pollen in the early spring. During the late spring and early summer, grasses often cause symptoms. Late summer and fall hay fever is caused by weeds.
Molds are tiny fungi related to mushrooms but without stems, roots or leaves. Their spores float in the air like pollen. Molds can be found almost anywhere, including soil, plants and rotting wood. Outdoor mold spores begin to increase as temperatures rise in the spring and reach their peak in July in warmer states and October in the colder states and year-round in the South and on the West Coast.
Pollen and Mold Levels
Pollen and mold counts measure the amount of allergens present in the air.
The National Allergy BureauTM (NABTM) is the nation’s only pollen and mold counting network certified by the American Academy of Allergy, Asthma & Immunology (AAAAI). As a free service to the public, the NAB compiles pollen and mold levels from certified stations across the nation and then publishes a rating of very high, high, moderate, or low concentration.
Effects of Weather and Location
The relationship between pollen and mold levels and your symptoms can be complex. Your symptoms may be affected by recent contact with other allergens, the amount of pollen exposure and your sensitivity to pollen and mold.
Allergy symptoms are often less prominent on rainy, cloudy or windless days because pollen does not move around during these conditions. Pollen tends to travel more with hot, dry and windy weather, which can increase your allergy symptoms.
Some people think that moving to another area of the country may help to lessen their symptoms. However, many pollen (especially grasses) and molds are common to most plant zones in the United States, so moving to escape your allergies is not recommended. Also, because your allergy problem begins in your genes, you are likely to find new allergens to react to in new environments.
There are also simple steps you can take to limit your exposure to the pollen or molds that cause your symptoms.
- Keep your windows closed at night and if possible, use air conditioning, which cleans, cools and dries the air.
- Try to stay indoors when the pollen or mold levels are reported to be high. Wear a pollen mask if long periods of exposure are unavoidable.
- Don’t mow lawns or rake leaves because it stirs up pollen and molds. Also avoid hanging sheets or clothes outside to dry.
- Consider taking a vacation during the height of the pollen season to a more pollen-free area, such as the beach or sea. When traveling by car, keep your windows closed.
Most important, be sure to take any medications prescribed by your allergist regularly, in the recommended dosage