Climate Action

Climate change could be prolonging and worsening your hay fever

Germany's Steffi Graf sneezes during her match against Lindsay Davenport of the U.S. in the final of the Ladies' Singles competition at the Wimbledon Tennis Championships July 4. Graf is seed number two in the tournament.JB/AS - RP1DRILDHIAC

Climate change is already altering flowering seasons worldwide and in turn, creating longer pollen seasons. Image: REUTERS

Every year, without fail, summer brings changes to our surroundings: more sunlight, heat, greenness and flowers, among many others. For some people, these changes also mean increasing physical discomfort because along with the flowers, trees and grass comes pollen.

The discomfort caused by pollen can be felt by many people, like watery eyes or a stuffy nose. More often than not, people first turn to the internet to find out what their symptoms mean and to identify some possible options for relief.

At its core, an allergic reaction means that our immune system is overreacting to a foreign particle that may be harmless otherwise. In some cases, the immune system deploys a defence, producing symptoms of airway irritation that resemble a cold, including a runny nose, watering eyes, fatigue and trouble breathing.

Even though the symptoms of an allergic reaction or an asthma attack are mostly felt in the respiratory system, they have been linked to other health conditions like myocardial infarctions and earlier deliveries in pregnant women.

As shown in this Google Trends result, searches for the term “seasonal allergies” in Canada tend to spike around the same dates as the pollen concentrations in the air do: around the third week of April.

Multiple pollen seasons

In our 2018 review of aeroallergens in Canada, we described how pollen seasons for weeds, trees and grasses have different start and end dates. Roughly, the seasons for most of the pollen that cause aches and irritation start around spring, with the exception of weeds — like ragweed — that tend to blossom in late summer.

Plant flowering depends on many environmental factors, such as humidity or minimum temperature, so it’s hard to pinpoint a national start date for the pollen seasons. It’s more likely that different places will experience pollen seasons that match their particular range of temperatures, flora and other aspects of their geography.

Because pollen concentrations depend so much on the environmental conditions that surround the plant that produces it, many changes in the environment can affect pollen concentrations and pollen seasons.

Climate change is already altering flowering seasons worldwide and in turn, creating longer pollen seasons. The dates that were traditionally considered the start and end of pollen seasons have become obsolete because the seasons are generally starting earlier and ending later.

Currently, in Canada, we breathe pollen for more days than before and, for those of us whose immune systems tend to overreact, we suffer from physical symptoms for longer stretches of time.

Individual differences

In addition to the environmental differences, we must consider individual differences too. Not everyone is affected by pollen in the same degree; for some people, the pollen season might go unnoticed if not for the change in scenery. However, for people whose immune systems have been sensitized to the allergenic proteins in pollen, the increased amounts of pollen in the air triggers very specific symptoms.

The immune system is responsible for our bodies’ response to pollen and reacts to perceived threats in a continuum that goes from diminished responses, like in immunocompromised individuals, to no physical reaction and then to heightened responses (allergies).

Have you read?
  • Reindeer are struggling to survive because of climate change

Because there is no known single cause for the development of allergies, it’s impossible to suggest a solution to protect oneself. However, for people who already suffer from allergies, some actions are known to be effective in decreasing the discomfort caused by their symptoms:

  • Be aware of the pollen concentrations in your area and stay indoors when they are high.
  • Take a shower or a bath before bedtime in order to avoid inhaling the pollen that might remain in your hair and body after going outdoors.
  • If you have been diagnosed with allergies (or asthma), or even if you have not been diagnosed but have felt symptoms in the past, schedule a consultation with your primary care provider before pollen season starts. In this appointment you can discuss potential actions to prevent your symptoms and, maybe even plan to use over-the-counter or prescription medications.
  • Consider allergy testing. This can pinpoint the allergen causing your symptoms and help in the treatment plan your physician will design with you.
  • Use air conditioners or a high-efficiency particulate air (HEPA) filter in your house, or in the rooms where you spend most of your oftime. These filters have proven to be useful for pollen as well as for the smoke caused during the wildfire season, which in some Canadian cities runs parallel to the last leg of the pollen season.

Even with the changes that climate change is already causing — and will continue to cause in the near future — pollen season still happens every year.

Taking a proactive stance and learning about your allergies and how pollen might affect you is a first step in controlling your symptoms, allowing you a more enjoyable spring, summer and fall outdoors.

Don't miss any update on this topic

Create a free account and access your personalized content collection with our latest publications and analyses.

Sign up for free

License and Republishing

World Economic Forum articles may be republished in accordance with the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License, and in accordance with our Terms of Use.

The views expressed in this article are those of the author alone and not the World Economic Forum.

Stay up to date:

Canada

Related topics:
Climate ActionHealth and Healthcare SystemsNature and Biodiversity
Share:
The Big Picture
Explore and monitor how Canada is affecting economies, industries and global issues
A hand holding a looking glass by a lake
Crowdsource Innovation
Get involved with our crowdsourced digital platform to deliver impact at scale
World Economic Forum logo
Global Agenda

The Agenda Weekly

A weekly update of the most important issues driving the global agenda

Subscribe today

You can unsubscribe at any time using the link in our emails. For more details, review our privacy policy.

1:52

A third less snow is falling in the Alps than 100 years ago

CEOs need to bridge the corporate cost of climate inaction

About us

Engage with us

  • Sign in
  • Partner with us
  • Become a member
  • Sign up for our press releases
  • Subscribe to our newsletters
  • Contact us

Quick links

Language editions

Privacy Policy & Terms of Service

Sitemap

© 2024 World Economic Forum