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Indoor Air Quality Monitoring

14 Apr 17:40 297,713 views | Last edited by Shannon 4 days ago

The Public Lab nonprofit is excited to announce that it has received support from the Passport Foundation to launch a pilot digital infrastructure and outreach program for people impacted by poor indoor air quality (IAQ). The project will give special attention to inhabitants of manufactured homes and emerges out of research by Dr. Nick Shapiro and Public Lab research on over 120,000 chemically contaminated former emergency housing units that were resold to under-resourced communities across the United States.

Unlike traditional, geographically organized environmental health concerns, sufferers of poor IAQ often comprise a dispersed network based around building material choices, home construction practices, and in-home behavior. Because of this, it is currently nearly impossible for sufferers of poor indoor air quality to come together to determine causes, impacts, and routes to advocacy. The goal of this pilot project is to create a cost-effective means of overcoming these limitations by creating an online database and community to connect sufferers of poor IAQ with each other and resources. The web platform will empower residents to gauge the magnitude of indoor air quality related illnesses; raise awareness of indoor air quality as a health threat; build a community of users in disparate geographic locations sharing stories and best practices; engage those affected in the process of assessment and mitigation; and begin to remedy the lack of epidemiological and symptomologic data on low-level domestic exposures.

Wireframes for IAQ website created by Nick Shapiro and Jeff Warren:

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2011-2012 Indoor Air Quality Mapping information

Purpose

This tool is being developed to experiment with mapping indoor air quality. A Roomba--the room cleaning vacuum--is programmed to travel all around a room once it is left to roam. Therefore, it is an ideal tool to assess the quality of air through out a room.

We have attached a sensor and light system to these second-hand Roombas. When our Roomba senses a change in air quality, currently an increase in the amount of volatile organic chemicals (VOC) in the air (we use alcohol as our test VOC) it emits a different color of light. If we take a long exposure image of our Roomba as it travels through a room, we can see the path its traveled by the light it emits. In areas where there are more VOCs, the light on Roomba changes from green to blue. Looking at this image, you can easily spot an area where there could be higher concentrations of VOCs.

Currently, we use the MQ 135 air quality sensor, to detect NH3, NOx, alcohol, benzene, smoke and CO2. In the future we will try adding a sensor for formaldehyde, which is a common and potentially harmful indoor air pollutant.

The U.S. EPA provides a good introduction to indoor air quality:

There are many sources of indoor air pollution in any home. These include combustion sources such as oil, gas, kerosene, coal, wood, and tobacco products; building materials and furnishings as diverse as deteriorated, asbestos-containing insulation, wet or damp carpet, and cabinetry or furniture made of certain pressed wood products; products for household cleaning and maintenance, personal care, or hobbies; central heating and cooling systems and humidification devices; and outdoor sources such as radon, pesticides, and outdoor air pollution.

Poor indoor air quality can take many forms, including high concentrations of chemicals (like formaldehyde, radon, or carbon monoxide). Sometimes these chemicals come from the products we use (like sprays) or the materials that surround us (like carpets and vinyl flooring). Excess humidity, or inadequate ventilation or filtration, can also lead to buildups of mold, pollen, or other biological contaminants. A simple and common form of poor indoor air quality is the buildup of CO2 (carbon dioxide) in poorly ventilated rooms. This can make you feel tired and less alert but is not usually otherwise harmful.

Immediate symptoms of exposure to toxic air contaminants include irritation of the eyes, nose, and throat; headaches; dizziness; and fatigue. Longer-term exposures (to lower concentrations) have been linked to chronic disorders, such as asthma.

Applications and example uses

Currently, there are very few tools for citizens to use in assessing indoor air-quality. The Toxic Mapper is our first attempt to generate DIY tools for investigating one's home environment and producing data rich images that are easy to interpret. The Toxic Mapper is still in development. We aim for it to be useful in indoor spaces such as those found in homes and schools.

This annotated image shows the basic parts for our Toxic Mapper v.1:

How to make your own

We are working on a step by step guide to Hacking your Roomba. We have produced a short video about the project:

We Also documented the Toxin-mapping Roomba Project in Montreal.

This image shows the basic parts of the Toxic Mapper V.1:

Wiring for the Toxic Mapper V.1 to connect VOC sensor to LED so the light color changes based on the sensor readings:

Close up image of wiring:

Arduino Code for VOC sensor in the Toxic Mapper V.1:

How to use it

Get involved! * Research is actively being done on this project by Jae Ok Lee and Byeongwon Ha in The RISD Environmental Justice Research Cluster in Providence. * and places to start contributing- * Hack your roomba! * Help us develop documentation. * advise us on indoor air-pollution issues? * List next steps: * Our next step is to try a formaldehyde rather than VOC sensor on the Toxic Mapper:[[http://publiclaboratory.org/notes/sara/12-13-2011/formaldehyde-sensing-indoor-air-pollution|More information on Formaldehyde]] * We also aim to sync up the Toxic Mapper's movements to the sensor speed. The Roomba moves much too fast to produce good readings -- the sensors take 15-30 seconds to detect anything -- so the group is working on a few ways to slow down the robot. One is to mechanically gear down the wheels with a kind of "scooter": Roomba scooter to slow it down The second is to use a more recent model of Roomba whose speed is programmable. We have purchased a Roomba 530 model and will be attempting to slow it down computationally rather than mechanically.


Tags: indoor-air-quality-mapping tool