IAQ related articles
https://www.epa.gov/indoor-air-quality-iaq/improving-indoor-air-quality
https://www.epa.gov/indoor-air-quality-iaq/introduction-indoor-air-quality#causes
https://publications.gc.ca/collections/collection_2019/sc-hc/H144-65-2019-eng.pdf
https://www.canada.ca/en/health-canada/services/air-quality/improve-indoor-air-quality-in-your-home.html (interesting graphes)
https://www.iotacommunications.com/blog/how-can-you-improve-indoor-air-quality/