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Major weather changes, such as El Nino, can affect the timing of allergy seasons. For example, in 1998, when the effects of El Nino were very strong, allergy attacks were markedly increased, and maximum tree pollen counts occurred 2 to 4 weeks earlier and mold counts 2 to 3 months earlier than the previous year.
Triggers of Perennial (Year-Round) Allergic Rhinitis
Allergens in the House. Allergens in the house can trigger attacks in people with year-long allergic rhinitis, called perennial rhinitis. Household allergens may include the following:
- House dust and mites. Dust mites, specifically mite feces, are coated with enzymes that contain a powerful allergen.
- Cockroaches
- Pet dander
- Molds growing on wallpaper, house plants, carpeting, and upholstery
However, some studies are suggest that early exposure to some of these allergens, including dust mites and pets, may prevent allergies from developing in the first place in children.
Fossil Fuels. There may be an association between traffic-related air pollution and allergic rhinitis. Some experts believe that refined fossil fuels, such as diesel fuel and particularly kerosene, are important triggers for allergic rhinitis. In people who already have allergies or asthma, exposure to such fossil fuels may worsen symptoms.
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