Madam Vice-Chair, members of the committee, I am pleased to be here today on behalf of the Canadian Thoracic Society and CHEO, the Children's Hospital of Eastern Ontario, to speak on this important issue.
I am a pediatric respirologist, or children's lung specialist, an associate professor of pediatrics at the University of Ottawa, and a senior author of the Canadian Pediatric Asthma Consensus Guidelines. I am recognized nationally for my research on air quality and respiratory health in Inuit children. I should admit that I'm currently redeployed as a physician at the CHEO emergency treatment unit for H1N1.
I want to outline for the committee today the issue of air circulation in an airplane passenger cabin and why that may present a problem for those with asthma and/or pet allergies.
As committee members have already heard, the main allergen produced by cats that people get allergic to is stored in their skin and fur. This is often referred to as dander. The allergen is often present in very tiny particles that can remain suspended in the air for extended periods of time.
Modern commercial airliners provide about 15 to 20 air changes per hour, which compares very favourably to a typical level of about 12 air changes per hour in a room, such as in an office building or this room, or about five changes per hour in your house. In addition, airliners have sophisticated HEPA filters for filtering out small particles, including allergens or micro-organisms. However, the situation is not as simple as this for two reasons: ventilation patterns and the use of upholstered seating.
Let's look at both issues one at a time. In terms of airliner air ventilation and circulation, air normally enters near the cabin ceiling, circulates around the cabin, and exits near the cabin floor. Less air moves along the length of the inside of the cabin. Research has shown that cabin airflow patterns do not entirely eliminate the risk that airborne bacteria travelling from one section to another. In any enclosed space, micro-patterns of air circulation can occur and can be very difficult to predict. For this reason and despite the sophisticated ventilation systems and HEPA filters, infections of tuberculosis and SARS, for example, have occurred on commercial flights, particularly among passengers a few seats over.
That's why in 1998 Air Canada banned serving peanuts aboard their flights. It is impossible to predict the possibility of allergens travelling from one part of an airplane to another.
Before Air Canada banned peanuts from being served on planes, I had one patient with peanut anaphylaxis who nearly died on a flight from London, England, to Ottawa after being exposed to the odours from other people eating peanuts.
Life-threatening reactions to nuts have been reported on commercial airliners by Comstock and co-workers in California. He reported two patients with severe life-threatening reactions, including one requiring diversion of the airplane, and a total of six who had to visit emergency departments after their flights. Over 60% of these reactions were caused by inhalation of allergens.
The second issue we need to consider is the cloth upholstery used in most airplane seats. Numerous studies have shown that pet owners can transmit pet allergens from their clothes to carpets and upholstered furniture in other locations such as schools. As well, allergens deposited on these surfaces can cause allergies and asthma in people exposed to these surfaces who have the relevant allergies.
A study by Martin and co-workers in New Zealand has already shown increased concentrations of cat allergen on commercial aircraft seats. In that study, 100% of the seats on commercial domestic flights and 14% on commercial international flights contained clinically significant levels of cat allergen.
A study by Custovic and co-workers shows that the amount of cat allergen present in upholstered furniture in the homes of people who have cats is 300 times higher than on the upholstered furniture in the homes of people who don't have cats. Thus, the amount of allergen deposited on aircraft seats is going to be vastly higher if that pet is present on board the plane than if only the owner is present on the plane.
While both Air Canada and WestJet have proposed moving people with animal allergies away from pets on airplanes, there are no proposed plans to ensure that people with pet allergies don't sit on a seat that was just occupied, or recently occupied, by a pet.
In addition, seating people with animal allergies away from animals on board may be impractical, given that families may want to stay together and given how crowded most airline flights are.
The issue isn't just one of allergic reactions and asthma attacks, but where these events could potentially take place. As you can imagine, having an asthma reaction here in Centre Block would not be a good thing, but it would be a vastly worse thing if it were happening at 40,000 feet, especially over water, where even an aircraft diversion would take time. People with allergies and asthma can and do have life-threatening asthma attacks, and the risk of having one on an airplane outweighs the purported commercial benefits to the airline of allowing people to bring their pets on board. There may also be a cost to the airline due to flight diversions.
In 2005 the Province of Ontario banned smoking in public places. At the time, the Ontario Medical Association noted--to be a little crude here--that having a non-smoking section in a restaurant is like having a non-peeing section in a swimming pool. From a medical perspective, maintaining a ban on pets on board Air Canada flights makes as much if not more sense than banning smoking in restaurants and voiding in swimming pools.
Thank you very much, Madam Vice-Chair.