Maintaining healthy indoor air quality

Mold in homes is a bad sign so how to get rid of it or prevent mold in drywall?

Mold and mildew in homes develops in conditions of high humidity, most often in bathrooms, kitchens and basements, unless caused by roof leaks and otherbuilding envelopefailures. Along with affecting the durability of your home, mold and mildew can cause or aggravate allergies, asthma and respiratory illnesses which means we should do everything possible to reduce mold growth.

Watch around the edge of bathtubs, showers and sinks for discoloration, and many basements finished or not can have a distinct musty smell that indicates a problem.

确定水分的来源是很重要的，这样才能解决问题。它通常是由于绝缘不充分导致冷凝，不适当的蒸汽密封，或水在浴室和厨房不被包含。

Along with proper design and keeping problem areas clean and dry, it is important to ensure bathroom fans, kitchen stove hoods and dryer vents are properly vented to the outside. If vents go up through your attic, be sure they aren't leaking, or more importantly that they aren't simply vented into the attic space, which does happen.

Basement mold & mildew prevention

That musty smell in basements that is all too familiar is due to either poorly installed insulation或者根本没有绝缘材料。地底建筑比地底建筑面临更大的挑战，因为墙壁不会向外干燥。Please see our pages onhow to prevent mold in basements guideandbasement insulation guideguide to further understand this and work on a solution.

Dehumidifiersare a quick and easy solution to persistent humidity problems, it's a matter of a couple of hundred dollars to buy one and plug it in. Make sure to get one that is rated for the size of space you have, they aren't all the same.

You should also see this as an energy saving solution, not something that will cost you more money. A dehumidifier will cost maybe $10 or $15 a month to operate, but it will likely offer you more than that in savings as it takes less energy to heat and cool dry air than humid air.

If you have a mould problem, clean it with detergent. But mould will always come back unless you address the issue that caused it. See our pages onventilation and air exchangersfor more information on home humidity.

VOCs

Volatile organic compounds form a large part ofhousehold chemical pollutants. Formaldehyde, benzene, toluene, alcohols and mineral spirits are the most commonly found VOCs in our homes. They can cause many adverse health effects including dizziness, nausea, fatigue, respiratory illnesses, and cause damage to your kidneys, liver and nervous system.

VOCs are commonly found in furniture, kitchen and bathroom cabinets, paints, household products, drapes, carpets and electronics.

TheAsthma Society of Canadasays that the number of asthma cases being diagnosed world-wide increases by approximately 50% per decade. At present 3 million Canadians suffer from asthma, a rate that has seen a significant rise in the last 20 years.

虽然研究人员尚未确定哮喘发病率上升的确切原因，但这些症状是由化学污染物、空气污染、灰尘、花粉和宠物皮屑引起的。所以我们关注家里的空气质量才有意义。

Where most people have heard the term VOCs is in regards to paint. There are many safer alternatives on the market now than the toxic paints we used to apply to our walls. For more information see our pages onsafer paints, or you could evenmake your own DIY safe no VOC natural paint with our guide here.

Formaldehyde

Formaldehydeis one of the more commonly found contaminants in homes, and is used in the production of most particle board, plywood, furniture, drywall, and electronic equipment.

当新材料被引入一个家庭时，伴随它们的气味一开始是相当明显的。这可以是任何东西，从家具，床垫，橱柜，甚至像电视和电脑这样的电子设备。

几天或几周后，你可能不会注意到那么多的气味，但这些污染物可以在许多年后继续释放。

According to Health Canada, formaldehyde is a probable carcinogen over extended exposure. While no level is truly safe, at 30 ppb (parts per billion) children’s lung capacity will be affected, and homes showing formaldehyde rates of between 60 and 120ppb had higher rates of bronchitis and asthma among children. At around 100ppb most adults will begin to notice throat irritations.

New homes will often measure as much as 300ppb or more, over 10 times the amount that has been determined to be unsafe, and formaldehyde is only one of approximately 80,000 chemicals commonly found in household items.

有许多无毒的产品可以替代我们允许进入家里的许多产品，这将促进更清洁的室内空气，改善健康。在现代社会，创造一个没有污染的家，同时保持我们习惯的便利设施是非常困难的，但把它看作是一个累积效应。无论你走到哪里，你都会暴露在空气中，所以尽量保持家里的空气清洁。

One big-ticket item we would recommend taking extra time on choosing is the kitchen, in particular by specifyingformaldehyde-free plywood for kitchen furniture- which is also available asformaldehyde-free and pre-finished UV cured VOC free plywoodwhich really brings out all the beauty of wood without filling the air in our homes with noxious chemicals.

Carbon monoxide (CO)

Carbon monoxide is often called the silent killer, as it is a colourless and odourless gas. Symptoms of exposure to high levels include headaches, nausea, fatigue, and disorientation. One of the reasons why it’s so dangerous is that people often think they’re sick, and instead of leaving the house, they go lie down, which can be fatal.

Carbon monoxide can find its way into your home by many means:

• Gas or oil furnaces in poor condition

• Unvented combustion appliances

• Poorly maintained chimneys

• Open fire placesLeaking wood stoves

• Improperly sealed garages attached to homes

Make sure any combustible appliances are well maintained, install CO detectors on each floor of your house, and if possible avoid attached garages. If you have an attached garage, check to see that it is well sealed on the common wall with your house.

Electromagnetic fields (EMFs)

There is pretty much no escapingelectromagnetic exposurein modern society, we are surrounded by it inside and outside our homes. Like so many other health concerns, it's just important to be aware of what the risks and concerns are so you can take the action you feel is necessary.

Whether or not EMFs are a health risk is continually being debated. In May of 2011 the World Health Organization recognized potential links between EMFs and cancer, but scientific research has shown no consensus either way.

Health Canada and the EPA has no guidelines for safe exposure, and while acknowledging potential links to cancer, their scientists have found no conclusive evidence and also point out that 'potential' links to cancer is a title that has been applied to many common substances.

This is meant neither to dismiss EMFs nor instill panic, but rather to tell you the issue is out there, and to help you make your own decisions. Humans have a long history of unknowingly exposing themselves to some pretty nasty things only to find out later how dangerous they are.

Some people believe they personally are strongly affected by EMFs and take significant steps to minimize exposure, including putting kill switches in all rooms to shut down currents running through walls.

If you are concerned, some simple actions you can take are:

• Not putting clock radios right beside your head when you sleep.

• 与微波炉保持距离。

• Shutting off wireless routers when not in use.

• Limiting the length of cell phone calls.

• 不买高压线下的房子。

• Keeping entertainment systems on a power bar you can easily shut off. There is a power draw through many appliances even when you are not using them. Many run warm even when not in use, and that ends up on your bill.

电磁强度随着距离的增加呈指数级下降，所以威胁和解决方案就在附近。不管你是否相信它是一种威胁，被盯着的锅永远不会沸腾，所以为了安全起见，不要把你的脸贴在微波炉的窗户上，它不会很快给你带来爆米花。

Flame retardants

Made from the chemical compounds chlorine or bromine,flame retardants毫无疑问，通过给我们宝贵的时间逃离燃烧的建筑物拯救了生命，但这些化学物质也进入了我们的水，空气和食物链。

Flame retardants are chemicals that have been added to home furnishings that slow the spread of fire. They can be found in almost all foam cushions of couches, beds, pillows, cars and baby strollers, as well as in electronic equipment like computers and television sets.

Due to health concerns there have been restrictions on brominated flame retardants (PBDEs), which has caused an increase in chlorinated flame retardants (CFRs), which may be safer but come with their own health risks, being a known carcinogen.

Health effects of PBDEs include links to reproductive disorders, complications during pregnancy and birth, behavioural development, attention deficit disorder and nervous system disorders.

Reducing your exposure:

Flame retardants will build up in household dust, so try to keep your home clean, and use aHEPA(High-Efficiency Particulate Arresting) vacuum filter. Avoid carpet under pads, and ensure that older foam cushions are well covered and not deteriorating.

While it is really not easy, you can try shopping for safer alternatives. They do exist, but you will probably have to do some leg work to find them.

Like so many other toxins, flame retardants build up infatty tissue. Consequently, predators higher on the food chain can have dangerously high levels, which in some cases includes humans. Air and water currents moving north have led to alarmingly high levels of flame retardants in polar bears, as well as people living in northern communities.

Outside of household furnishings, to further reduce your exposure choose lean cuts of meat, low fat dairy products, and avoid farmed salmon, a notoriously high source of flame retardants.

Big fish eat little fish, and the toxins in the little fish move up the food chain.

See here for more information on keeping flame retardants out of your home.

Radon gas

Radon gas is a relatively unknown household danger. Of the people that have heard of it, not many realize the severity of health effects associated with it. Radon gas is released through the radioactivedecay of uranium, and it is the radioactivity of it that makes it a danger to humans.

Health Canada estimates that radon gas is the cause of 10% of alllung cancer deaths每年有2000名加拿大人死亡。在加拿大，安大略和西魁北克的空气污染水平最高。美国环保局也有很多关于氡气有害健康影响的资料。

Radon enters homes throughcracks in foundations,as well as from our water supply as it is aerated through showers and faucets. This is really only a problem for well water, most municipal systems come from lakes and rivers and have minimal levels.

For severe cases of radon in water there are solutions that can remove the gas, but they can be quite expensive. If you are in a high risk area and you don't have a proper radon vent, the amount in your water is probably negligible compared to the amount coming in through your basement, so your money might be better spent on sealing your foundation.

During new construction, a proper vapour barrier under your concrete floor and installing a radon vent will eliminate the problem for very little money. It's a simple matter of a 3 or 4 inch pipe with a T at the bottom underneath your slab, that is vented to the outside.

• Read more on the health effects of radon gas & how to prevent it in homes & crawlspaces see here

Kids and how poor air quality in the home can be dangerous for their health

To be clear, I'm not listing them as a pollutant, but rather the effects of pollutants on them.

Newborns and young children are particularly vulnerable to home pollutants as their lungs are still just developing. The first instinct when you are expecting a child is to start preparing your home for them, which inevitably includes new furniture. Clothes fresh out of the laundry and put into new cabinets will absorb formaldehyde as it off-gasses, which is not good for little lungs.

New baby clothes right off the rack will often contain many times the amount of formaldehyde that is deemed safe by the World Health Organization.

这是买二手货或去旧货店的另一个原因。洗过很多次的旧衣服实际上比大多数全新的衣服要“干净”得多。

Short of that, you can check labels and find suppliers that don’t use chemicals in production. You might spend a bit more, but they are relatively easy to find.

There are safer alternatives to a lot of the chemicals we introduce into our homes; it just takes a bit of research and buying from suppliers that are aware of these issues.

Now you know about maintaining healthy indoor air quality, learn more aboutsustainable construction for healthy and durable homesin theEcohome Building Guide pages Find more pagesaboutsustainable and resilient green building techniques here: How to service HRV & ERV units at home for optimum efficiency Where to buy and choose safe zero VOC paints Choosing formaldehyde and VOC free new furniture How to create a healthy home office with Biophilic Interior Design Find more about green home constructionin the EcohomeGreen Building Guide pages- Also, learn more aboutthe benefits of a free Ecohome Network Membership here.