Dustin Poppendieck
@poppendieck.bsky.social
Indoor air quality scientist. Thoughts are my own. No financial interests in air cleaners, monitors or other related devices.
Over 400 people in the US die each year due to unintentional carbon monoxide poisoning, and 100,000 visit the ER (www.cdc.gov/carbon-monox...).
EPA just published a new factsheet and infographic to help avoid CO poisoning (hint: indoor combustion).
tinyurl.com/35ck5b5w
tinyurl.com/y8wdtdp4
EPA just published a new factsheet and infographic to help avoid CO poisoning (hint: indoor combustion).
tinyurl.com/35ck5b5w
tinyurl.com/y8wdtdp4
November 14, 2025 at 2:11 PM
Over 400 people in the US die each year due to unintentional carbon monoxide poisoning, and 100,000 visit the ER (www.cdc.gov/carbon-monox...).
EPA just published a new factsheet and infographic to help avoid CO poisoning (hint: indoor combustion).
tinyurl.com/35ck5b5w
tinyurl.com/y8wdtdp4
EPA just published a new factsheet and infographic to help avoid CO poisoning (hint: indoor combustion).
tinyurl.com/35ck5b5w
tinyurl.com/y8wdtdp4
EPA Indoor Air Fact Sheet:
www.epa.gov/indoor-air-q...
www.epa.gov/indoor-air-q...
July 16, 2025 at 3:56 PM
EPA Indoor Air Fact Sheet:
www.epa.gov/indoor-air-q...
www.epa.gov/indoor-air-q...
Another great NIST Summer Institute Middle School Science Teachers workshop on Indoor Air Quality (tinyurl.com/3ve6typx) in which the teachers learned how depth filters work and built five Corsi-Rosenthal boxes complete (tinyurl.com/86df5y2b).
This year we got a bee themed air filter!
This year we got a bee themed air filter!
July 3, 2025 at 12:12 PM
Another great NIST Summer Institute Middle School Science Teachers workshop on Indoor Air Quality (tinyurl.com/3ve6typx) in which the teachers learned how depth filters work and built five Corsi-Rosenthal boxes complete (tinyurl.com/86df5y2b).
This year we got a bee themed air filter!
This year we got a bee themed air filter!
The apples on the NIST Newton apple tree are growing fast this year.
June 27, 2025 at 6:41 PM
The apples on the NIST Newton apple tree are growing fast this year.
300,000 air change measurements?!
Classroom air change averaged 3.0/h (about required), but varied significantly: between schools, within each school and within each classroom throughout the year.
Great work from @patriciafabian.bsky.social's group.
www.sciencedirect.com/science/arti...
Classroom air change averaged 3.0/h (about required), but varied significantly: between schools, within each school and within each classroom throughout the year.
Great work from @patriciafabian.bsky.social's group.
www.sciencedirect.com/science/arti...
June 20, 2025 at 12:34 PM
300,000 air change measurements?!
Classroom air change averaged 3.0/h (about required), but varied significantly: between schools, within each school and within each classroom throughout the year.
Great work from @patriciafabian.bsky.social's group.
www.sciencedirect.com/science/arti...
Classroom air change averaged 3.0/h (about required), but varied significantly: between schools, within each school and within each classroom throughout the year.
Great work from @patriciafabian.bsky.social's group.
www.sciencedirect.com/science/arti...
Schools with mechanical ventilation have lower CO2 concentrations than those without.
BUT all schools have significant variability between classrooms showing importance of monitoring each classroom.
More great work from @patriciafabian.bsky.social's group.
www.sciencedirect.com/science/arti...
BUT all schools have significant variability between classrooms showing importance of monitoring each classroom.
More great work from @patriciafabian.bsky.social's group.
www.sciencedirect.com/science/arti...
June 20, 2025 at 12:24 PM
Schools with mechanical ventilation have lower CO2 concentrations than those without.
BUT all schools have significant variability between classrooms showing importance of monitoring each classroom.
More great work from @patriciafabian.bsky.social's group.
www.sciencedirect.com/science/arti...
BUT all schools have significant variability between classrooms showing importance of monitoring each classroom.
More great work from @patriciafabian.bsky.social's group.
www.sciencedirect.com/science/arti...
This is probably not a good idea for reviewing a standard for a ballot. But I can see people taking the short cut.
June 11, 2025 at 9:54 AM
This is probably not a good idea for reviewing a standard for a ballot. But I can see people taking the short cut.
Well that is one way to increase ventilation...
June 9, 2025 at 3:23 PM
Well that is one way to increase ventilation...
Lupin season in Iceland.
June 9, 2025 at 1:16 PM
Lupin season in Iceland.
The only thing we can't ban from buildings is humans.
(5/5)
(5/5)
June 8, 2025 at 5:49 PM
The only thing we can't ban from buildings is humans.
(5/5)
(5/5)
#HB25-E
Joseph Lstriburek.
"It is okay for things to get wet if they can dry." We have reduced the ability for things to dry but not the ability to to get wet.
(1/n)
Joseph Lstriburek.
"It is okay for things to get wet if they can dry." We have reduced the ability for things to dry but not the ability to to get wet.
(1/n)
June 8, 2025 at 5:49 PM
#HB25-E
Joseph Lstriburek.
"It is okay for things to get wet if they can dry." We have reduced the ability for things to dry but not the ability to to get wet.
(1/n)
Joseph Lstriburek.
"It is okay for things to get wet if they can dry." We have reduced the ability for things to dry but not the ability to to get wet.
(1/n)
Healthy Buildings 2025 - Europe is getting started.
Excited to learn from the world about how we can be healthier indoors.
@isiaq.bsky.social
Excited to learn from the world about how we can be healthier indoors.
@isiaq.bsky.social
June 8, 2025 at 2:27 PM
Healthy Buildings 2025 - Europe is getting started.
Excited to learn from the world about how we can be healthier indoors.
@isiaq.bsky.social
Excited to learn from the world about how we can be healthier indoors.
@isiaq.bsky.social
Q3) Does Air Change rate vary within a school? YES!
Q4) Does Mechanical HVAC increase air change rate in schools? YES!
So excited to see more of these types of papers.
Q4) Does Mechanical HVAC increase air change rate in schools? YES!
So excited to see more of these types of papers.
June 2, 2025 at 12:16 PM
Q3) Does Air Change rate vary within a school? YES!
Q4) Does Mechanical HVAC increase air change rate in schools? YES!
So excited to see more of these types of papers.
Q4) Does Mechanical HVAC increase air change rate in schools? YES!
So excited to see more of these types of papers.
It is HERE!
Boston public school classroom CO2 sensor analysis. Over 100 million CO2 observations from 3206 sensors across 125 schools.
www.sciencedirect.com/science/arti...
Q1) How good are the sensors? +/- 75 ppm.
Q2) Does air change rate change a lot in a classroom? YES
Boston public school classroom CO2 sensor analysis. Over 100 million CO2 observations from 3206 sensors across 125 schools.
www.sciencedirect.com/science/arti...
Q1) How good are the sensors? +/- 75 ppm.
Q2) Does air change rate change a lot in a classroom? YES
June 2, 2025 at 12:16 PM
It is HERE!
Boston public school classroom CO2 sensor analysis. Over 100 million CO2 observations from 3206 sensors across 125 schools.
www.sciencedirect.com/science/arti...
Q1) How good are the sensors? +/- 75 ppm.
Q2) Does air change rate change a lot in a classroom? YES
Boston public school classroom CO2 sensor analysis. Over 100 million CO2 observations from 3206 sensors across 125 schools.
www.sciencedirect.com/science/arti...
Q1) How good are the sensors? +/- 75 ppm.
Q2) Does air change rate change a lot in a classroom? YES
Ever wonder if those real-time radon sensors work?
www.sciencedirect.com/science/arti...
Reasonably well.
www.sciencedirect.com/science/arti...
Reasonably well.
June 2, 2025 at 12:01 PM
Ever wonder if those real-time radon sensors work?
www.sciencedirect.com/science/arti...
Reasonably well.
www.sciencedirect.com/science/arti...
Reasonably well.
Exhaled aerosol particles (1-5 um) create a wake behind people walking down hallways. Cool CFD simulations with implications for hospital corridors.
If only this article was out in 2019....
www.sciencedirect.com/science/arti...
If only this article was out in 2019....
www.sciencedirect.com/science/arti...
June 2, 2025 at 11:57 AM
Exhaled aerosol particles (1-5 um) create a wake behind people walking down hallways. Cool CFD simulations with implications for hospital corridors.
If only this article was out in 2019....
www.sciencedirect.com/science/arti...
If only this article was out in 2019....
www.sciencedirect.com/science/arti...
What is our legacy?
April 18, 2025 at 6:34 PM
What is our legacy?
Another cool preprint from @jljcolorado.bsky.social's group.
They show a MnOx-based catalyst removing GUV222 nm generated ozone, with only a 12.5% loss over 16 weeks.
They show complex catalyst chemistry with oxidized VOCs decreasing, but reduced VOCs increasing.
chemrxiv.org/engage/chemr...
They show a MnOx-based catalyst removing GUV222 nm generated ozone, with only a 12.5% loss over 16 weeks.
They show complex catalyst chemistry with oxidized VOCs decreasing, but reduced VOCs increasing.
chemrxiv.org/engage/chemr...
April 11, 2025 at 2:51 PM
Another cool preprint from @jljcolorado.bsky.social's group.
They show a MnOx-based catalyst removing GUV222 nm generated ozone, with only a 12.5% loss over 16 weeks.
They show complex catalyst chemistry with oxidized VOCs decreasing, but reduced VOCs increasing.
chemrxiv.org/engage/chemr...
They show a MnOx-based catalyst removing GUV222 nm generated ozone, with only a 12.5% loss over 16 weeks.
They show complex catalyst chemistry with oxidized VOCs decreasing, but reduced VOCs increasing.
chemrxiv.org/engage/chemr...
Interesting GUV222 pre-print by @jessekroll.bsky.social's group.
A manganese oxide catalyst-based air cleaner reduced secondary chemistry related to GUV222 generated ozone. AND it delivered a 290 m3/h CADR for formaldehyde!
Although, it did emit acetone and NO.
chemrxiv.org/engage/api-g...
A manganese oxide catalyst-based air cleaner reduced secondary chemistry related to GUV222 generated ozone. AND it delivered a 290 m3/h CADR for formaldehyde!
Although, it did emit acetone and NO.
chemrxiv.org/engage/api-g...
April 10, 2025 at 8:02 PM
Interesting GUV222 pre-print by @jessekroll.bsky.social's group.
A manganese oxide catalyst-based air cleaner reduced secondary chemistry related to GUV222 generated ozone. AND it delivered a 290 m3/h CADR for formaldehyde!
Although, it did emit acetone and NO.
chemrxiv.org/engage/api-g...
A manganese oxide catalyst-based air cleaner reduced secondary chemistry related to GUV222 generated ozone. AND it delivered a 290 m3/h CADR for formaldehyde!
Although, it did emit acetone and NO.
chemrxiv.org/engage/api-g...
AGU's conference center in Washington DC has a municipal sewer heat exchanger to heat and cool the building.
They also have demand control ventilation with CO2 readings visible to occupants.
Cool AGU!
They also have demand control ventilation with CO2 readings visible to occupants.
Cool AGU!
March 20, 2025 at 4:39 PM
AGU's conference center in Washington DC has a municipal sewer heat exchanger to heat and cool the building.
They also have demand control ventilation with CO2 readings visible to occupants.
Cool AGU!
They also have demand control ventilation with CO2 readings visible to occupants.
Cool AGU!
Nice to see a portable air cleaner operating in the doctors office exam room.
March 10, 2025 at 7:49 PM
Nice to see a portable air cleaner operating in the doctors office exam room.
Stand up for Science. DC edition.
March 7, 2025 at 8:40 PM
Stand up for Science. DC edition.