There are new technologies that allow for laser particle counting for homeowners. This group is set up to encourage people using these monitors (e.g. Dylos, PurpleAir) to share their experiences, troubleshoot problems with the devices, and interpret the data and its implication on indoor air quality.

215 Members

You need to be a member of Building Performance Community to add comments!

Join Building Performance Community


  • ROCIS will be presenting with some other great speakers at the upcoming virtual "One Health, One Planet" symposium hosted by Phipps Conservatory and Botanical Gardens 10/19-10/23. The talks will cover air quality, how it applies to Pittsburgh, and what needs to be done.

    More info & Registration below:…/one-health-one-planet/
    Home | Phipps Conservatory and Botanical Gardens | Pittsburgh PA
    Home | Phipps Conservatory and Botanical Gardens | Pittsburgh PA
  • an interesting home experiment that we saw with some DIY fan filters:

    "This is a home office in an unfinished dry basement with laundry and lots of things stored around. The experiment was performed over the weekend, so there was minimal activity in the space.

    The space is about 350 sqft and for maximum effect the homeowner moved two box fan filters with MERV-11 20X20X5" filters with 1" charcoal pre-filters. When on, the filters both ran at medium speed.

    The filters were shut on and off several times during the course of the weekend.

    The air conditioner was also turned on for one of the periods that the filters were off, to see the effect of the AC on particulate concentration.

    The peaks correspond EXACTLY to the three periods that the filters were off. With two filters running at medium speed it takes about 1 hour to bring the peaks down to the 1-2 µg/m3 range.

    The higher peak was during the period that the AC was on, but filters were off.

    It looks like it takes about 3-4 hours for levels to increase to peak levels after filters are turned off."
  • IAQ Radio show for 5/22 at 12PM, covering Mechanical Systems & COVID:
    The Voice of the Indoor Air Quality Industry
  • new study out of Harvard for covid/air pollution interaction:
    Air Pollution and Coronavirus
    A Harvard study is one of several that have now suggested that air pollution is affecting COVID-19 mortality.
  • TIME SENSITIVE!! Today 3-4 PM Webinar - Health & Air Quality Effects of Gas Cooking (and solutions)
    There is also a webinar on the findings of this report today Wed 5/6 from 3-4 PM and you can register here if interested:…
  • A new report has just been released on the health & indoor air quality effects of gas cooling. Go to to download the report.
    RMI transforms global energy use to create a clean, prosperous, and secure low-carbon future.
  • Here's the HomeChem study summary- this includes some cooking observations as well:
    HOMEChem: House Observations of Microbial and Environmental Chemistry
    We have chosen a set of experiments that focus on the two most common everyday activities to the air chemistry of indoor environments: cooking and cl…
  • Italians finding the virus is attaching to airborne particles:
  • Some new data on the air quality in Allegheny County:
    Get the State of the Air report card for the air quality in Allegheny including high ozone days, particle pollution and groups at risk.
This reply was deleted.
E-mail me when people leave their comments –

Filter Fans: What works, what doesn't for window box fan + furnace filter

Filter FansA furnace filter duct taped to a box fan makes a remarkably good and inexpensive particulate filter. Linda Wigington has been advocating for them and using them in ROCIS cohorts. This thread is meant to discuss what works and what doesn't.I've got a Dylos again, and so I'm measuring stuff that I can't with the other IAQ monitors I have: Foobot, uHoo, Awair, and NetAtMo. Namely I'm watching small particles.Linda Wigington uses a 4" MERV 11 or MERV 13 filter on a standard 20" square…

Read more…
5 Replies · Reply by Linda Wigington Sep 8

Carbon Filter Cloth or Bulk Carbon Filters for Ozone & Odor Reduction

I first heard of low cost strateigies using carbon cloth to reduce ozone & odors,or to prevent ozone generation in homes from Richard Corsi, Check out the IAQ Radio episode addressing this exploration.We are recruiting folks who want to experiment with attaching carbon cloth to a box fan /high MERV filter to test its performance either in a window, or within a home or workspace.Check out the radio interview. Let us know what you think!

Read more…
2 Replies