I encourage folks to do their own research, but here are some of the resources I was able to find during my own journey. 

About VOCs​

"Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs include a variety of chemicals, some of which may have short- and long-term adverse health effects." [link] 

• EPA: https://www.epa.gov/indoor-air-quality-iaq/volatile-organic-compounds-impact-indoor-air-quality
• Kaiterra: https://learn.kaiterra.com/en/air-academy/understanding-tvoc-volatile-organic-compounds 

VOC Monitors

Personal (These devices let you know if you should ask questions, but don't really give you any answers. I also recommend learning about VOCs before using them as normal activities like cooking or cleaning can make these monitors spike, but that's probably expected.)

• Kaiterra Chemical: https://www.kaiterra.com
• Blue Air Classic "Intelligent" series: https://www.blueair.com/
• Temtop: https://temtopus.com/collections/temtop-tvoc-monitor
• ATO: https://www.ato.com/air-quality-monitor
• VSON: https://www.amazon.com/VSON-Detector-Formaldehyde-Humidity-Temperature/dp/B07P8L2T7C?th=1
• EG: https://www.amazon.com/Air-Formaldehyde-Detector-Pollution-Particulate/dp/B074FTVHFN/

Chemical Testing

• Home Air Check: https://www.homeaircheck.com/products/
• Intertek VOC Testing: https://www.intertek.com/chemicals/voc-testing/
• Intertek Formaldehyde: https://www.intertek.com/chemicals/formaldehyde/​
• Great Plaines Lab, GPL Tox Screen: https://www.greatplainslaboratory.com/gpl-tox/​
• CDC Chemical Odor Search: ​https://www.atsdr.cdc.gov/odors/search_results.html​​​

homeaircheck.com

Air Filters

• Blue Air: https://www.blueair.com (carbon filters) 
• Mila: https://www.milacares.com

Learn about Indoor Air

• ALA, Clean Air at Home: https://www.lung.org/clean-air/at-home
• EPA, Introduction to Indoor Air Quality: https://www.epa.gov/indoor-air-quality-iaq/introduction-indoor-air-quality
• EPA, Air Cleaners and Air Filters in the Home: https://www.epa.gov/indoor-air-quality-iaq/air-cleaners-and-air-filters-home
• CPSC, The Inside Story: A Guide to Indoor Air Quality: https://www.cpsc.gov/Safety-Education/Safety-Guides/Home/The-Inside-Story-A-Guide-to-Indoor-Air-Quality/