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AIR POLLUTION & INDOOR AIR QUALITY
Air pollution causes 7 million premature deaths every year and is now the single biggest environmental health risk, according to the World Health Organization. Luckily, nature has already solved many of the problems we humans are grappling with, and that goes for air pollution as well. An arrangement of three common houseplants can result in measurably cleaner indoor air, protecting us from the air pollution and smog that have become an inescapable part of our urban environments.
Nature is brilliant. Human beings have had only the blink of an evolutionary eye to invent things,
while nature has benefited from a 3.8-billion-year head start in research and development.
With that level of investment, it only makes sense to look to nature for solutions before trying to invent them ourselves.
That was what Indian researcher Kamal Meattle did. He lives in New Delhi, one of the most polluted cities in the world. When Meattle’s lung capacity had fallen by 70 percent and he became allergic to New Delhi’s air, he either needed to move or to find a solution. Along with his research team and with the help of valuable research from NASA, Meattle discovered that three common houseplants had complementary abilities to detoxify indoor air, not only enriching it with oxygen, but also reducing incidence of eye irritation, respiratory problems, headache, lung injuries and asthma.
Some facts about Indoor Air Quality that are worth pondering over:
* According to the US Environment Protection Agency (EPA), indoor air is 3 to 7 times more polluted than outdoor air.
* The EPA ranks indoor air pollution as one of the top five threats to public health.
* People in urban environments spend as much as 90% of their time indoors.
So indoor air is far more likely to impact our health than outdoor air.
* The average human being takes in about 20,000 breaths a day, circulating an estimated 10,000 litres of air through the lungs.
* The EPA also informs that 6 out of 10 US homes and buildings are “sick” or hazardous to one’s health.
Some of the symptoms associated with “Sick Building Syndrome” are asthma, allergies, headache, fatigue,
irritations in the nose, eyes and throat, respiratory and sinus congestion.
* Primary sources of poor indoor air quality are due to the consequences of modern building design:
hermetically (or tightly) sealed buildings (which was encouraged during the ’70s oil shock to improve energy efficiency
of buildings), with very little ventilation and increasing use of synthetic furnishings which release
Volatile Organic Compounds (VOCs) or toxic chemicals into the air.
HOW TO GROW FRESH AIR
As we race towards 2022, technological advances are occurring at an astounding rate. We seem to a have an unquenchable thirst for the gadgets and technical wizardly that make our lives more productive and pleasurable.
At the same time, however, we struggle to preserve our links with nature, and growing plants in our homes and workplaces
is widely accepted as means of retaining this connection with the natural world.
The cold, impersonal reality of steel and concrete are softened by the cool, peaceful effect of foliage.
Yet houseplants can do more than enhance the appearance of our surroundings:
they can play an integral role in improving the very essence of our lives - the air we breathe.
In order to conserve energy resources, over the past 50 years buildings have been even more efficiently sealed from
the air outside. While tightly sealed buildings reduce energy consumption, gases from synthetic materials are trapped inside with deleterious effects upon the well-being of their occupants. Many people spend up to 90 percent of their time indoors,
an long-term exposure to these chemical vapors has brought dramatic in erases in the number of cases allergy, astray, chemical hypersensitivity and cancer. Indoor air pollution is now considered by many experts to be one of the major threats
to health Attempts to reduce the incidence of “ sick building syndrome” have resulted in increased ventilation, the use
of low-emission preventive maintenance procedures. However, problems still persist. Ironically, the technology arising form futuristic spa exploration may have revealed natural solutions that are as old as the earth itself.
The NASA, face with the task of creating a life-support system for moon bases, began extensieve studies on treating and recycling air and wastewater. These studies led scientists to ask a very important question. How does the earth produce and sustain clean air? The answer, of course, is through the living process of plants.
With this basic knowledge, NASA scientists began to study the development of sustainable, closed ecological life-support facilities. Working towards these goals, they discovered that houseplants could privy and revitalize air in sealed test-chambers. These studies are still helping todays green revolution. As ever-increasing numbers of the population become concerned about the direct correlation between the indoor environment and their health, this green revolution will continue to spread.
With our combined technology and a symbioses of the natural benefits of plants and the latest, high-end technology of Awair, OTree, Nextera and Genano, we attempt to stress the importance of indoor air quality and to relate how our existence is interwoven into a symbiotic - or mutually beneficial - relationship with the animals and plants of our living world. Evidence is offered widely to show how houseplants can indeed become an integral component of healthy buildings, whether homes or offices, and information is provided on how different houseplants can improve the air in ones “personal breathing zone”.
PLANTS TO IMPROVE INDOOR AIR QUALITY
Indoor plants are a very effective measure for improving indoor air quality, and they also provide energy savings
and a mood boost for occupants. Thanks to research by NASA, there is solid scientific evidence than plants
can remove common harmful substances found in modern building interiors.
To complete the list of benefits, indoor plants can be a useful tool for building owners seeking a LEED certification,
allowing the accumulation of credits across many categories assessed by the US Green Building Council.
There are many ways in which technology can be deployed to enhance indoor air quality (IAQ), including ventilation system upgrades, humidity controls, air filtering, or recently smart home automation. So, why improve air quality with… just plants?
As NASA found out in their space stations, the use of indoor plants offers some exclusive benefits
that are not available with other IAQ measures.
Plants can absorb pollutants while providing oxygen. Ventilation systems can imitate this effect by providing
a constant supply of fresh air and exhausting indoor air, but strictly speaking the air in the building is not purified.
Only plants are capable of restoring the air already inside a building to the state in which it is found in nature.
After a plant is purchased, its cost of ownership is nearly zero. Plants only require soil, water, sunlight and cleaning.
Man-made air filters consume energy and have a running cost, in addition to requiring frequent cleaning.
In addition, air filters that have become clogged with dust may require removal by a qualified person
– they may release a large amount of dust and pollutants if not handled properly.
Indoor environments with air conditioning have existed for a relatively short period of human history.
Our ancestors lived outdoors among plants for hundreds of millennia before the first civilizations,
so it makes sense to bring plants and outdoor air into modern buildings.
Modern trends in energy-efficient building design have an unfortunate side effect: buildings are becoming air-tight
and isolated from the outdoor environment. While this reduces the load on heating and cooling equipment, providing energy savings, it also traps air and IAQ is negatively affected unless mechanical ventilation and indoor plants are used.
Sick Building Syndrome (SBS), a phenomenon where the health of occupants deteriorates based on how much time
they spend in a building, has been caused in great part by the combination of air-tightness and poor ventilation.
Also consider that many modern building materials release pollutants, adding another factor that is detrimental for IAQ.
Although mechanical ventilation and air filters can provide satisfactory levels of IAQ by themselves, plants can take over a significant portion of the job, while making indoor environments more appealing and improving the mood of occupants.
Scientific Evidence for the IAQ Benefits of Plants
According to the American Journal of Public Health, indoor sources account for 90% of air pollutants in modern buildings.
There is scientific evidence that IAQ can be improved with plants, which remove bad compounds from the air in 3 main ways:
Some pollutants are metabolized into harmless or even beneficial substances. According to the Canadian Journal of Botany, plants can absorb carbon monoxide (CO) from the air in urban settings.
First they convert it to carbon dioxide (CO2) through oxidation, and then they use CO2 for photosynthesis, producing oxygen. Plants can also metabolize benzene (C6H6), decomposing it into carbon dioxide and water.
Other plants also capture harmful compounds and integrate them as part of their tissues, removing them from indoor air.
An example of this is ammonia (NH3): it is harmful for humans, but can be processed into amino acids by plants.
The bacteria that live in the soil around the roots of plants are mostly harmless for humans,
and are also capable of metabolizing and decomposing harmful substances.
In other words, each plant constitutes a small-scale ecosystem that improves indoor conditions for humans.
The basic principle of improving IAQ with plants is very simple: if the goal is to replicate nature in built environments,
the smartest move is to bring plants indoors, since they are the planet’s natural air conditioning system.
NASA & INDOOR AIR
Research on Plants and IAQ
NASA has carried out extensive research on the potential of plants to improve indoor air quality. In outer space, where there is no outdoor air, the only viable way to preserve IAQ over long periods of time is to remove pollutants while replenishing the oxygen content – no technology developed so far is capable of matching plants in that role.
Bill Wolverton is a retired NASA scientist who studied the applications of plants in air and water purification, and he made an interesting discovery: plants become much better air filters when air circulation to their roots is improved. As previously stated, the bacteria living in the soil around plant roots are generally harmless for humans and can contribute to air purification.
Wolverton also discovered that each plant species has “preferences” when it comes to the air pollutants that are filtered out. Therefore, indoor air quality tends to improve as the variety of indoor plants is increased.
In general, NASA recommends one indoor plant for every 100 square feet of space.
Bill Wolverton’s main conclusion has been that mankind must bring nature into isolated environments in order to provide healthy living conditions. Air-tight buildings are a great example of an environment that is isolated from nature,
and the interior of space stations represents a more drastic case where outdoor air is not available.
Plants have a remarkable ability to metabolize harmful substances. For instance, NASA has discovered that some swamp plants are capable of metabolizing Agent Orange, a potent herbicide. This substance is only found in controlled laboratory environments, so cleaning it with plants has no applications in homes and commercial buildings;
however, it is a great example of how plants can be used to eliminate toxic substances.
HARMFULL CHEMICALS THAT CAN BE REMOVED BY PLANTS
There is a broad range of pollutants that can be removed from indoor air with plants, but NASA studies have focused on the following, which are potentially harmful for humans and pets:
Trichloroethylene (C2HCl3): This chemical induces a mood boost in very small amounts,
but can also lead to severe health consequences. C2HCl3 has been associated with nausea, headaches and vomiting,
and large enough concentrations can cause loss of consciousness and coma.
Formaldehyde (CH2O): The human response to this chemical ranges from mild ailments like nose and mouth irritation,
to severe reactions such as lung and larynx swelling.
Benzene (C6H6): Small-scale exposure causes eye irritation, headaches, confusion and accelerated heartbeat.
Like trichloroethylene, it can cause a loss of consciousness in high enough concentrations.
Xylene (C8H10): Reactions to small-scale exposure include mouth irritation and headache,
while long-term exposure can lead to heart, liver and kidney problems.
Exposure to a large amount of xylene in a short time induces coma.
Ammonia (NH3): This chemical can cause eye and throat irritation, and induces coughing.
From its research on plants, NASA has determined which species are the best filters for each of the pollutants presented.
In 2008, the Indian government also published an very interesting study on how plants improve IAQ,
focusing on the Areca Palm, the Mother-in-Law’s Tongue and the Money Plant.
INDIAN RESEARCH
Indian Government Research on Plants and IAQ
The study had a duration of 15 years and was carried out for the Paharpur Business Centre, a 25-year old building with over 50,000 square feet of floor space and over 300 workers. A total of 1,200 plants of the three species mentioned above were planted, and the results were surprising:
Most surprising of all was the fact that indoor plants improved other aspects beyond IAQ.
The building became less reliant on the HVAC system to treat the air, achieving 15% energy savings. In addition,
an average productivity increase of 20% was achieved. From the business standpoint,
it can be concluded that indoor plants are a lucrative investment!
34% Less respiratory ailments
52% Less eye irritation
24% Less headaches
Respiratory ailments were decreased by 34%. In particular, lung impairments were reduced by 12% and asthma by 9%.
Eye irritation was reduced by 52%.
Headaches were reduced by 24%.
Recommendations to improve Indoor Air Quality with plants
Like with any building improvement, careless implementation may backfire, bringing more harm than benefit.
Even when dealing with plants, there are some important aspects to consider:
Some occupants may be allergic to specific plants. Before making widespread use of indoor plants, conduct a survey of allergies experienced by occupants. If any of the building occupants suffer from allergic rhinitis, also known as hay fever,
be careful to select plants that do not trigger it.
Plants tend to increase indoor humidity: This is great in dry environments, since air humidification expenses are reduced. However, they may exacerbate moisture and mold issues in buildings that are already experiencing them.
Some plants are toxic if ingested. This is not an issue for adults, who understand the consequences of eating these plants,
but their use is not recommended if located within the reach of children or pets.
Avoid flowering plants: they release pollen, which causes allergic reactions in some people.
Ragweed is notorious for triggering allergic reactions due to the large amounts of pollen it releases.
Consider the use of LED grow lights to complement indoor plants.
The output of these lights is designed to stimulate photosynthesis and healthy plant growth.
LEED-CERTIFIED BUILDINGS
Leadership in Energy and Environmental Design (LEED) is a certification framework for buildings that was introduced by the US Green Building Council. When a building applies for LEED certification, it is assessed across several sustainability categories and is awarded a level of certification depending on the total score achieved: Certified, Silver, Gold and Platinum.
It is important to note that LEED certifications are available for buildings in any place of the world,
even if the certification is awarded by a US-based organization.
One of the categories in which a building can accumulate points is Indoor Environmental Quality (IEQ).
Strictly speaking, points are not awarded directly for the use of indoor plants, but rather for deploying measures that remove VOCs and other indoor pollutants. However, the effectiveness of plants in this aspect has already been demonstrated through research. The following are some creative ways in which plants can be deployed to earn LEED credits:
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Biofilter Walls: Basically, a biofilter is a wall filled with hydroponic plants, which is integrated with the ventilation system
to improve air quality. Air is forced across the plant-filled wall, enhancing their ability to capture and remove pollutants.
The Smart Greenwall developped by Groenwand is one of these examples.
Biophilia: If you replicate nature indoors and can prove that occupants respond positively to it,
you can accumulate LEED credits. Conducting a survey is a way to prove that interior landscaping has been well-received.
Health Improvements: If you can provide evidence that plants have helped you reduce absenteeism and illness,
you can obtain LEED credits as well.
Energy Conservation: Plants can help you reduce ventilation loads and the fan power loss associated with forced-air filtering. The 2008 study carried out by the Indian government provided evidence of this,
reducing HVAC loads by 15% with the use of indoor plants.
Water Conservation: Indoor plants may boost relative humidity by up to 5 percent.
This can help conserve water in conditions where active humidification is required.
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Although LEED does not give direct credit for the use of plants, they can be deployed creatively to achieve credits in categories related to air quality, design, energy efficiency and occupant health. You can achieve extra credits if the plants
are grown locally and if you use recycled materials whenever possible.
A building with a LEED certification is guaranteed to provide energy efficiency and healthy indoor conditions. In addition,
there is a marketing benefit for companies with LEED-certified buildings: they are viewed as corporate citizens and environmental stewards, making their products and services more attractive for clients who share their values.
Indoor plants themselves can also help companies establish a green corporate image.
