Finding F-0707

“The odds of previous COVID-19 infection were 1.21 (95% CI: 1.01, 1.51) times higher for those exposed to AN; the odds of self-reported long COVID-19 disease were 3.69 (95% CI: 1.11, 16.6) times higher for those exposed to NO2.”

Tillery et al. Indoor Air Nicotine, Nitrogen Dioxide Exposure, and COVID-19 Outcomes in a Great Plains Tribal Community (2026). Indoor air. Page 2. CKB 6516

Structure

Factor: Nitrogen dioxide (NO₂)
Outcome: COVID-19
Population: members of multigenerational Tribal households
Setting: home, US
Study design: community-engaged cross-sectional study in a Great Plains Tribal community (Cheyenne River Sioux Tribe): 290 multigenerational households, week-long passive monitors for airborne nicotine and nitrogen dioxide, saliva serology for SARS-CoV-2 and a questionnaire on COVID-19 outcomes; multilevel logistic regression grouped by household, adjusted for age, sex, household income and household size (class 4)
Effect: OR 3.69 (1.11–16.6)
Sample: 100 homes
Caveat: long COVID-19 disease is filed under covid-19; the sentence does not state the exposure contrast for NO2 (for nicotine the paper uses detection above the limit of detection) and air concentrations were log-transformed in the models, so no increment is recorded; NO2 was measured in only 100 homes, hence the wide interval

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.