Indoor Air Quality Researcher. Views expressed are my own. No financial interests in HVAC, portable air cleaners or indoor air quality monitors.
7 added to My Authors
Oct 14, 2022 • 25 tweets • 9 min read
What is the next step to improve Indoor Air Quality (IAQ)?
After the White House summit on Indoor Air Quality (#WHIAQ) many people asked what is next?
This thread explores EIGHT actions that federal, state, and/or local jurisdictions, along with standard and codes bodies can do NOW to improve IAQ.
Stephanie Guerra. OSTP. Assistant Director for Health Security and Biodefense.
- Responsible innovation of technologies can help improve IAQ in a wide spectrum of indoor environments.
1/@CorsIAQ. It is not going to require rocket science to improve IAQ. We have the tools to do it now. If we do it we will get better health outcomes. We need to make sure we don't leave any community behind. We need accessible tech for IAQ.
Taryn Williams. Ass. Secretary of Labor for Disability Employment Policy. Improving IAQ in schools, homes and workplaces is an issue of equity (YES). Those who vulnerable are more likely to be affected by poor IAQ.
Kenneth Mendez. Asthma and Allergy Foundation of America. 25 Million Americans have Asthma and 4,000 people die per year (1:13 people). 5 Million children. Asthma is leading cause of missed school days. Cost is up to $82 billion (?). Need better IAQ to reduce triggers.
Oct 11, 2022 • 14 tweets • 3 min read
#WHIAQ. Why improving IAQ makes good business sense.
Jordan Silberman. Monumental Sports (Capital One Arena in DC). Baseline post pandemic now thinks about more than just security. Created a system to track safety AND IAQ through building wide monitoring.
Michele Schneider. Salesforce. 6 million sq feet management. Workplace design focused on well being in the past. Now IAQ is on the list and a core value.
Kevin Kampschroer. GSA. The only reasons buildings exist is to take care of people in them (YES).
Oct 11, 2022 • 11 tweets • 2 min read
#WHIAQ Schools. Alex Marrero. Denver County Public Schools Superintendent.
Jesus Jara: Clark County School District Superintendent.
(Lost the intro thread.... But both have districts that with 10,000s of staff/teachers and 90,000 plus students). 1/
- Clark County has 10,000 homeless students.
- Marroro. Funding and policy. Has spent $25 million on IAQ (MERV 13 filtration as standard and IAQ monitoring). What happens when money ends? Filters need to exchanged. 2/
- Indoor air quality is the next front for public health.
- Drinking water improvement was a long term systematic change. We need the same effort for IAQ.
- It becomes harder to imaging how our health care system can manage respiratory diseases. 1/
- The single biggest structural change we can make to address respiratory transmission is to improve indoor air quality.
- We need health buildings, because we need healthy communities. 2/
- Indoor dust can be resuspended by human activity. Dust can be use as a tracer to determine the presence/absence of RNA (i.e. SARS-COV2).
- Deployed indoor air cleaners in homes/classroom where people who COVID positive.
- In home cleaners placed in isolation room, outside and in the main living area. After 1-2 weeks dust was removed from filters => extracted => qPCR analysis.
- How do homes recover when impacted from wildfires.
- @LioraMael notes that her home burned down in the Marshall fire the day before she was to move in. #RealworldImpacts
- Looked particulate matter in a house on the edge of the Marshall fire roughly one month after the fire.
- Cleaning activities increased the particle concentrations in the home.
- Does long term exposure of Tobacco Specific Nitrosamines (TSNAs) lead to negative health impacts.
- Previous research shows TSNAs stick to surfaces. TSNAs hard to measure due to reactivity (esp NNN, NNK).
- Added HONO enriched air to chamber with cloth coated with nicotine to create TSNA. Examined cellulose and cotton with/without sweat and skin oil.
- ALPACA - Investigation in artic air quality in urban artic environments.
- When it is -14F(?C) people are inside. But in Fairbanks there is a high prevalence of wood burning stoves.
- What happens when you move polluted air from outdoors indoors with a 50 C temperature difference?
- In general outdoor PM10 concentrations higher outdoors than indoors, EXCEPT when pellet stove was used inside the house. 2/
- What happens on surfaces when wildfire smoke comes indoors?
- Indoor surface films are complicated, diverse, chemical mixtures, patchy and remain for periods longer than the air change rate (weeks/months).
- Gas surface reactions can happen. But so can reactions WITHIN the condensed phase film.
- You can find third hand smoke tracers in houses of people who don't smoke.
- CASA was a huge collaborative research group project to investigate indoor chemistry experiments related to wild fires, ozone, and surface aging. 1/
- "Clean air act has really worked." With respect to sulfate.
- The world needs more scientists and engineers working on public health (fact check; True!)
- Exposure to PM2.5 is the second leading cease of years lost of life (DALYs). (fact check: this includes exposure from cookstoves). 1/
- We aren't allowed to choose the air we breathe. We breathe what we get.
- The hazard ratio increases from 1 to 1.1 when PM2.5 goes from 2.8 to 14 ug/m3 equating to about 60,000 increased deaths per year in the US. 2/
Oct 4, 2022 • 4 tweets • 3 min read
Excited to attend my first AAAR conference today in Raleigh, NC.
Looking forward to meeting twitter friends I have never met in person, some great talks from the #CASAChem and ALPACA projects and learning new aerosol science.
Why do peak CO2 concentrations change from one day to the next for the same room?
Let's look at what may change on a daily time scale and impact ventilation:
Let's focus on the second one today (assuming same people and activity level). 1/9
Wind blowing on a building results in high pressure on the upwind side of the building, low pressure on the downwind side. This pressure difference can suck air into the building, increasing the ventilation rate. 2/9