RTCA Dr Helen Davies Part 1 - The Lung Chemistry Model in Python: A new computational model for predicting asthma exacerbation risk from indoor air pollutants

Transcript

1. Helen Davies, Toby Carter, Jakub Lukaszonek, Huda Badri, Jillian Barlow, Terry Dillon, Katherine Bridge, Nic Carslaw
2. Overview • Volatile Organic Compounds in Indoor Environments • VOCs and asthma • The Lung CHEMistry Model in Python (LungCHEM-Py) • In-lung VOC chemistry • Biological effects of VOCs
3. Why is Indoor Air Quality Important? 90% of time Zou, 2010; Classification of buildings with regard to airtightness
4. Indoor Air Quality • Many sources and types of indoor air pollutants • Volatile organic compounds (VOCs) • Particulate Matter (PM) • Biologicals (mould, viruses etc.) Diagram courtesy of Toby Carter
5. Indoor Air Quality • Many sources and types of indoor air pollutants • Volatile organic compounds (VOCs) • Particulate Matter (PM) • Biologicals (mould, viruses etc.) Diagram courtesy of Toby Carter
6. Where do VOCs come from? Davies et al, 2023; A measurement and modelling investigation of the indoor air chemistry following cooking activities
7. Where do VOCs come from? Spices → Monoterpenes Oil heating → Aldehydes Vegetables → Alcohols Davies et al, 2023; A measurement and modelling investigation of the indoor air chemistry following cooking activities
8. Where do VOCs come from? Spices → Monoterpenes Oil heating → Aldehydes But what happens to these species over time? Vegetables → Alcohols Davies et al, 2023; A measurement and modelling investigation of the indoor air chemistry following cooking activities
9. Secondary Chemistry VOC + O3/OH/NO3
10. Secondary Chemistry RO → formaldehyde RO2 + NO Carcinogen RNO3 VOC + O3/OH/NO3 → Organic nitrates ? Reduce lung function RCO3 + NO2 RCO3NO2 → Peroxyacylnitrates (PANs) Irritants
11. Secondary Chemistry RO → formaldehyde RO2 + NO Reaction Chemistry Timed Emissions Indoor-Outdoor Exchange Surface Deposition Carcinogen RNO3 VOC + O3/OH/NO3 → Organic nitrates An open-source, 1D box model ? Reduce lung function RCO3 + NO2 Time-evolved Species Concentrations RCO3NO2 → Peroxyacylnitrates (PANs) Irritants Shaw et al, 2023; INCHEM-Py v1.2: a community box model for indoor air chemistry
12. Secondary Chemistry RO → formaldehyde RO2 + NO Carcinogen RNO3 VOC + O3/OH/NO3 → Organic nitrates ? Reduce lung function RCO3 + NO2 RCO3NO2 → Peroxyacylnitrates (PANs) Irritants