IAQM Indoor Air Quality conference 2020 Outdoor Indoor Air Quality Interactions: Current Issues

1. Case Study: Air Quality in and
around Schools and Nurseries in
Central London
Monday 22 June 2020
Dr Peter Walsh,
Technical Director

2. 2
— Air Quality Audit Schools and Nurseries in Central London
— Baseline Ambient Air Quality in Central London
— Sampling and Detection Criteria for NO2 in Schools and
Nurseries
— NO2 in Schools / Nurseries
— Pollutant Infiltration into Buildings
— Advantages Combining Passive Sampling and Indicative
Monitoring
Case Study Content

4. Air Quality Audits of 20 Central London Nurseries

5. Baseline Ambient Air Quality in Central London

6. Nitrogen Dioxide Exposure of Pupils Major Issue
in Central London

7. 7
Sampling and Detection Criteria for NO2 in
Schools and Nurseries
— Robust
— Quantitative
— Traceable
— Established Recognised
Method
— Good detection limits
(low)
— Discrete
— Quiet
— Low power demands
— Inexpensive
— Low risk (hazard free)

8. 8
Sampling and Detection Criteria for NO2 in
Schools and Nurseries
— Robust
— Quantitative
— Traceable
— Established Recognised
Method
— Good detection limits
(low)
— Discrete
— Quiet
— Low power demands
— Inexpensive
— Low risk (hazard free)
Diffusion Tubes –
Passive sampling
Zephyr –
Indicative Sampling

9. 9
Diffusion NO2 Monitoring Nursery Schools

10. 10
Diffusion NO2 Monitoring Nursery Schools

11. 11
Diffusion NO2 Monitoring Nursery Schools

12. 12
Diffusion NO2 Monitoring Nursery Schools

13. 13
Nitrogen Dioxide Infiltration Dependant on
Airtightness and Operation
Nurseries Low Infiltration:
— Well-Sealed Windows and
Doors
— Play Areas Removed from
Traffic
Nurseries High Infiltration:
— Older Draughty Buildings
— Play Areas Close to Traffic/
Streets

14. 14
Diffusion NO2 Monitoring Schools

15. 15
Diffusion NO2 Monitoring Schools

16. 16
Diffusion NO2 Monitoring SchoolsDiffusion NO2 Monitoring Schools

17. Continuous NO2 Monitoring
Two Zephyrs used for continuous monitoring of NO2,
inside and outside each school for 14 days
Low Infiltration
Internal Monitor External Monitor

18. Continuous NO2 Monitoring
Two Zephyrs used for continuous monitoring of NO2,
inside and outside each school for 14 days
High Infiltration
Internal Monitor External Monitor

19. 19
Nitrogen Dioxide Infiltration Dependant on
Airtightness and Operation
School Low Infiltration:
— Well-Sealed Windows and
Doors
— School Set Away from Road
School High Infiltration:
— Older Draughty Building
— Entrance Very Close to
Central London Traffic

20. Advantages Combining Passive Sampling and
Indicative Monitoring
Small, Low Power
Light, and Secured above Pupil
Height
Rapid set-up, No Enclosure,
Small Footprint
Standardised
Methodology,
Access to Raw data
Low Cost Options
Available
Quiet and Discrete
method
01
Low Risk/ Hazard Free
02
03 Adaptable and Easy to
Deploy
04
05
Combination of Robust
and high resolution data
Inexpensive

21. Thank you
Monday 22 June 2020