Finding · as stated by the study, recorded by Coridum · status verified-machine
Finding F-1287
“Outdoor levels were two to three times higher.”
Structure
- Factor
- Formaldehyde (CH₂O)
- Population
- pupils aged 11 to 15
- Setting
- classroom, CN (winter)
- Study design
- cross-sectional study in a coal-burning city in northern China: a questionnaire on respiratory health and home environment was answered by 1,993 pupils aged 11 to 15 in ten urban schools of Taiyuan, and indoor and outdoor air pollutants and climate factors were measured in the same schools in winter (class 4)
- Caveat
- the sentence writes the ratio in words and covers all four measured pollutants together
A Finding records what one published document states, verbatim and with its page. It is not a conclusion of Coridum; see the Claims that build on it.