aka pollution, dust Study linking air pollution to mental disorders: https://www.kcl.ac.uk/news/study-supports-link-between-traffic-related-air-pollution-and-mental-disorders Calgary air quality: https://www.cbc.ca/news/canada/calgary/calgary-air-quality-map-ranking-1.4547149 Woodgears (Matthias Wandel) page on dust: https://woodgears.ca/dust/dylos.html https://woodgears.ca/dust_collector/index.html Study of low-cost sensor accuracy: https://www.hindawi.com/journals/js/2018/5096540/ Experiments on DIY air purifier: https://news.t0.vc/QZKP https://dyno-might.github.io/2020/12/15/some-real-data-on-a-DIY-box-fan-air-purifier/ Sensors ======= Fancy serial one with inlet: - SDS011 - $17 USD https://www.aliexpress.com/item/32606349048.html One Farzad gave me: - DSM501A - $4 USD https://www.aliexpress.com/item/1005001710572424.html Fancy commercial one: - DC1100 PRO - $289 USD Professional fluke: - Fluke 985 - $7000 CAD Good digikey one: - https://www.digikey.ca/en/products/detail/honeywell-sensing-and-productivity-solutions/HPMA115S0-XXX/7202204 - connector? https://www.digikey.ca/en/products/detail/molex/0151340803/6198165 --- NO - cable per sensor: - 4 x 900-2149211112-ND (pre-crimped lead) - 1 x WM1726-ND (connector housing)