A destructive wildfire that consumed hundreds of thousands of acres near Ft. McMurray, Alberta, is having a major impact on air quality in places as far away as northern Missouri. As a result of the fire in Canada, the U.S. Environmental Protection Agency issued air quality alerts as far away as Des Moines, Iowa, 1700 miles from where the wildfire was burning. Local officials urged residents to stay indoors during the worst conditions.
The recent wildfire in Alberta is the latest example of a disturbing pattern of increasing wildfires in the U.S. and Canada. Nine of the 10 largest wildfires in the U.S. in recent history have occurred since 2000. The U.S. Forest Service now spends more than 50% of its annual budget on firefighting, compared to 16% just 20 years ago. In Canada, hundreds of wildfires burned throughout the nation in 2015 as a result of scorching temperatures and drought.
The trend is likely to continue, and wildfires are likely to be a health concern for areas far downwind from where wildfires burn. More than ever, It is important to know what steps to take when remote or nearby wildfires affect the air quality where you live.
Wildfire smoke travels farther than previously thought
In one recent study, researchers discovered that rural wildfire smoke drifts farther from its source than was previously thought. Examining satellite data to track the movement and dispersal of smoke plumes, they found that wildfire smoke drifts at a very high altitude, eventually reaching distant urban centers and interacting with other pollutants to create elevated ozone levels far from the fire source.
Previous studies had found that wildfires release nitrogen oxide and hydrocarbons that contribute to elevated ozone levels, but those effects were seen mostly in rural areas, not distant urban centers far removed from the fires. Elevated ozone levels are a major health concern, particularly in urban areas. Breathing ozone can trigger a variety of negative health effects, including coughing, throat irritation and congestion in healthy people. Furthermore, ozone can also worsen symptoms of bronchitis, emphysema and asthma.
Wildfires and heart attacks
Another recent study, published in the Journal of the American Heart Association, reported new evidence of a connection between wildfire smoke particles and acute heart disease, including cardiac arrest. Smoke particles that are 2.5 microns or less in diameter (known as “fine” particles) in particular were found to be associated with a short-term increased risk of cardiac arrest. The study also found an increase in emergency-department hospital visits associated with exposure to fine smoke particles from wildfires.
Although other studies have previously established the link between fine smoke particles and respiratory problems such as asthma, this new study clarifies the link between wildfire smoke and heart disease. Specifically, the study reported a 6.9% increase in cardiac arrests during a two-month period as a result of exposure to wildfire smoke particles near Victoria, Australia. The increase was most strongly associated with men and with people more than 65 years old. Increases were also found in other forms of heart disease.
How to protect yourself from wildfire smoke
Unfortunately, the frequency and severity of wildfires in much of the U.S. is expected to continue growing in the coming years. Therefore, there are precautions you should be ready to take if wildfires occur in your area. Here are a few suggestions:
- Protect your indoor air. Keep windows and doors closed. If you use an air conditioner, be sure to keep the fresh-air intake closed. A high-performance air purifier such as the IQAir HealthPro Plus will help remove smoke particles of all sizes from the indoor air. The HealthPro Plus will also help control ozone levels. This is critical if you live in an urban area downwind (even remotely) from wildfires.
- Remain indoors as much as possible. Indoors is often the best place to be when wildfire smoke is affecting your area. This is especially true for those with respiratory or heart disease, the elderly and children.
- Wear a mask outdoors. A paper dust mask or surgical mask is not sufficient to help protect you against inhaling particles. Instead, choose a respirator mask with an N95 or N100 rating to help protect against smoke particles.
- Avoid activities that further pollute the indoor air. Avoid burning candles, using the fireplace, or even vacuuming (unless you own a high-performance HEPA vacuum cleaner). All of these can otherwise become additional sources of indoor air pollutants.
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