Mr. Speaker, in response to a) From 1993 to 1996, Health Canada published three conference papers on the development of a laboratory study of aircraft noise-induced stress on people.
The only Health Canada published studies with a specific focus on aircraft noise were two reviews of the scientific literature on aircraft noise. One is a peer reviewed journal article in 2007 on aircraft noise-induced sleep disturbance and the other is a 2001 report on aircraft noise, stress and cardiovascular disease.
Aircraft noise has appeared in other studies by Health Canada, such as a very preliminary field study designed to examine possible relationships between noise annoyance and stress. This was presented in a poster at a 2007 University of Ottawa 4th year honours thesis symposium.
Aircraft noise was also noted in a national survey of noise annoyance published in a 2002 HealthInsider report, Number 7, and a peer reviewed literature article in 2005.
Aircraft noise annoyance was also used as an example in a 2008 published analysis of how noise annoyance can be used as a health impact in environmental assessments.
A study of annoyance and disturbance of daily activities from road traffic noise was also published in 2008 based on a 2005 HealthInsider report (Number 14)
Health Canada has also published a total of three laboratory studies on the potential for noise-induced stress in either rats, two studies, one published in 2003 and the other in 2005, or people, one published in 2006, using noise sources other than aircraft noise.
In response to b) Results are listed below from the various published studies that are relevant to the potential for a stress response to aircraft noise.
In the review of aircraft noise and sleep disturbance, it was found that people living around airports show disturbed sleep in the form of awakenings and increased body movement. Aircraft noise is one reason, but it is responsible for less sleep disturbance than spontaneous awakenings and other indoor noise events.
The review of the scientific literature on aircraft noise and cardiovascular disease indicated that average blood pressure levels of schoolchildren exposed to aircraft noise were slightly elevated, however there was no conclusive proof that aircraft noise caused chronic stress in children. Also, in adults, although scientific studies have shown that short term exposure to intense noise can cause temporary stress responses such as increases in heart rate and blood pressure, there is no consistent evidence that chronic noise leads to hypertension. Furthermore, it was found that, although there was insufficient evidence to conclude that aircraft noise causes heart disease, some studies suggested that people who live for many years in areas with intense road traffic noise, may face a slight increase in the risk of developing heart disease.
In the review of the scientific literature on noise annoyance, it was found that there was some evidence to suggest an association between road traffic and neighbourhood noise levels and some stress related adverse effects e.g., hypertension and migraines. It was also found that on average a given long term exposure to aircraft noise makes a greater percentage of a population highly annoyed than would road traffic noise. Furthermore, in a national survey of road traffic noise annoyance in Canada, it was found that people who were highly annoyed by road traffic noise, also thought this annoyance had a negative impact on their health.
In a laboratory study, exposure of people to noise events during sleep did not appear to create a stress response. It was also inconclusive as to whether there were adverse effects on their sleep.
In the very preliminary field study where exposure to aircraft noise occurred, the number of subjects was too small to obtain reliable conclusions about any possible relationships between stress hormone responses and annoyance level.
In response to c) Health Canada plans the following research studies to help assess plausibility of a cause-effect relationship between noise, including that from aircraft, and stress related adverse health effects: i) examination of potential correlations between annoyance to road traffic noise and actual health effects reported in surveys, ii) a study of stress markers in noise exposed rats that are predisposed to hypertension.
The following future reviews are also planned: (i) for fiscal year 2010-2011, an interim review taking into account recent developments in the scientific literature on the potential for aircraft noise-induced stress-related adverse health effects - to update the Health Canada It’s Your Health document on aircraft noise, (ii) for fiscal year 2011-2012, a comprehensive review paper on the scientific literature on potential links between stress, cardiovascular disease and environmental noise.