(I'm OP of this submission, but otherwise unrelated to the story so can't answer questions on it.)
The article also contains a link to the source study, "Impacts of ambient air quality on acute asthma hospital admissions during the COVID-19 pandemic in Oxford City, UK: a time-series study" - https://bmjopen.bmj.com/content/14/1/e070704
Which includes:
"STRENGTHS AND LIMITATIONS OF THIS STUDY
- This study investigated the association between ambient air pollution exposure and risk of admission to hospital for asthma.
- The study includes an at-risk population of >800,000 person-years.
- Associations were evaluated using single and multipollutant models.
- Causation cannot be inferred from this observational study.
- A single city study may limit wider generalisation of findings."
(And I didn't exactly use the original article title despite it being a perfect 80chars, to be able to include the 41% figure - from "Asthma emergency admissions plunged as lockdown improved air, Oxford study finds".)
The article also contains a link to the source study, "Impacts of ambient air quality on acute asthma hospital admissions during the COVID-19 pandemic in Oxford City, UK: a time-series study" - https://bmjopen.bmj.com/content/14/1/e070704
Which includes:
"STRENGTHS AND LIMITATIONS OF THIS STUDY
- This study investigated the association between ambient air pollution exposure and risk of admission to hospital for asthma.
- The study includes an at-risk population of >800,000 person-years.
- Associations were evaluated using single and multipollutant models.
- Causation cannot be inferred from this observational study.
- A single city study may limit wider generalisation of findings."
(And I didn't exactly use the original article title despite it being a perfect 80chars, to be able to include the 41% figure - from "Asthma emergency admissions plunged as lockdown improved air, Oxford study finds".)