These slides have been adapted from those provided by Liesl McConchie
Be sure to review her guide on this and customise these slides to fit your school
Dr. Kimberly Prather: https://twitter.com/kprather88/status/1687588887521112064
Glass-of-water icons created by Freepik - Flaticon
We drink 2-3 L of water a day.
Water can contain pathogens.
We filter our water.
We breathe 11,000 L of air.
Air can contain
pathogens.
We do not filter our air.
Why not?
5
REASONS TO CARE
ABOUT YOUR SCHOOL’S
INDOOR AIR QUALITY
1
ILLNESS
Wang, C. C., Prather, K. A., Sznitman, J., Jimenez, J. L., Lakdawala, S. S., Tufekci, Z., & Marr, L. C. (2021). Airborne transmission of respiratory viruses. Science, 373(6558), eabd9149.
Many
respiratory viruses
are transmitted through the air
Wang, C. C., Prather, K. A., Sznitman, J., Jimenez, J. L., Lakdawala, S. S., Tufekci, Z., & Marr, L. C. (2021). Airborne transmission of respiratory viruses. Science, 373(6558), eabd9149.
Guo, Y., Dou, Z., Zhang, N., Liu, X., Su, B., Li, Y., & Zhang, Y. (2023). Student close contact behavior and COVID-19 transmission in China's classrooms. PNAS nexus, 2(5), pgad142.
Long-range aerosols
are the dominant
form of transmission
Source: COVID-19 Mortality in Aotearoa New Zealand Inequities in Risk, Manatū Hauora | Ministry of Health, September 2022
�
Covid-19 Mortality Rates (age-adjusted)
2
EQUITY
Persons with disabilities are at greater risk of developing more severe health conditions and dying from COVID-19.
https://www.un.org/sites/un2.un.org/files/2020/05/sg_policy_brief_on_persons_with_disabilities_final.pdf
3
LONG COVID
Teachers are at highest risk of covid-19 infections
Source: Review of COVID-19 Protection Framework settings – 27 July 2022, Manatū Hauora | Ministry of Health, obtained by OIA
https://www.edweek.org/leadership/1-in-5-educators-say-theyve-experienced-long-covid/2022/04
have experienced
Long Covid.
1 in 5 teachers
experience long covid symptoms at least
3 months post covid
Jiang, L., Li, X., Nie, J., Tang, K., & Bhutta, Z. A. (2023). A Systematic Review of Persistent Clinical Features After SARS-CoV-2 in the Pediatric Population. Pediatrics, 152(2).
1 in 6 kids
4
ABSENT
STUDENTS
Source: Ministry of Education NZ
“The main driver of absence in Term 1 2023 continued to be medical reasons. Incidence of COVID-19 in the community continued to have an impact this term, resulting in absences for both students and staff.”
“Absence from school is associated with substantially lower attainment – that is, every day matters”
5
COMMUNITY
of household spread of Covid-19 started with a child, according to study of 850,000 US households.
*Rates dropped during school breaks.
**Younger kids under 8 more likely source of transmission than kids 9-17.
Tseng, Y. J., Olson, K. L., Bloch, D., & Mandl, K. D. (2023). Smart Thermometer–Based Participatory Surveillance to Discern the Role of Children in Household Viral Transmission During the COVID-19 Pandemic. JAMA Network Open, 6(6), e2316190-e2316190.
70%
1
ILLNESS
2
EQUITY
3
LONG COVID
4
ABSENT STUDENTS
5
COMMUNITY
ACH
AIR CHANGES PER HOUR
The number of times that the total air volume in a room or space is completely removed and replaced in an hour.
Imagine if you froze the air in a room into a cube…
�And then swiped left on that stale air
�Then brought in one room’s worth of new air…
�That’s one air change!
�
Image shared by @iaqadvocates
CDC rec 5 ACH
https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/improving-ventilation-in-buildings.html#:~:text=Improving%20ventilation%2C%20filtration%2C%20and%20air,viral%20particles%20in%20the%20air.&text=Aim%20to%20deliver%205%20or,viral%20particles%20in%20the%20air.
CDC recommends 5 ACH
How many Air Changes per Hour (ACH)
do you think you’re getting in your classroom?
A) 1.7 ACH
B) 3.6 ACH
C) 6.6 ACH
D) 9.6 ACH
WINDOWS AND DOOR SHUT
1.17 ACH ☹
ACH
-1 x ln(
Replace this with your own data
B) 3.6 ACH
C) 6.6 ACH
D) 9.6 ACH
How many Air Changes per Hour (ACH) can we get with windows/doors open?
WINDOWS AND DOOR OPEN
6.6 ACH ☺
Replace this with your own data
IF WE CAN GET HVAC ON
1.17 ACH -> 3.6 ACH
Replace this with your own data
Some libraries have CO2 monitors�to borrow
Whose Breath are you Breathing?
< 1%
1 - 1.5%
1.5 - 4%
> 4%
Typical day in my child’s classroom
Typical week in my child’s classroom
Talent Show in the theater at my kids’ school
Talent Show in the theater at my nephew’s school
“Open House” at my kids’ school
Source: Tether
Instructions
https://github.com/oseiler2
A PC Fan Corsi-Rosenthal Box adds an additional 4.4 ACH*
*based on average NZ classroom size of 70m², if used properly:
Instructions
https://github.com/oseiler2
A) 1.7 ACH
B) 3.6 ACH
C) 6.6 ACH
D) 9.6 ACH
How many Air Changes per Hour (ACH)
do you want?
Download this graphic from Joey Fox HERE.