Hello. I've seen many many posts of people that are very upset (rightfully so) and concerned over the GMA leak that happened a week ago.
I live in one of the most affected neighborhoods about 1.8 miles west of the leak site. I spent days being extremely concerned like all of you but have nearly no concerns after putting in the effort to understand what happened and how our health might be affected.
I have compiled a short summary document that should hopefully give people ease of mind when it comes to the leak, exposure levels, and the short and long-term health effects people have/may experience from this incident.
Full disclosure: I am not a scientist but I do understand on basic levels many of the concepts that pertain to the chemical leak and all of the topics described within due to a background in mechanical engineering and computer science. I have utilized the power of an AI system (Claude pro which I use for work) to do some math and modelling of the leak and create the document summary. PLEASE DO NOT JUST DISMISS THIS BECAUSE OF THE USE OF AI.
The output of this document has been highly driven by my inputs and the input of all of the publicly released data, including many revisions and many edits to make sure the document isn't just ai slop responses and is not just me going "oh hey give me an answer" and then sharing the response. I have spent hours inputting public information, including a direct timeline of my personal experience living through the leak in the SIP zone, and my symptoms, having it make estimates and refined the info many times over as more information has been released. The exposure estimates are based on all of the epa data points, the temperature measurements of the tank throughout, public reporting of the travel of the plume (initial westward travel), the weather conditions, etc.
I hope this gives people comfort on the danger they are feeling and the potential future health effects which are very likely to be zero.
THIS IS NOT AN OFFICIAL SCIENTIFIC DOCUMENT. IT IS A ROUGH ESTIMATE BASED ON THE AVAILABLE DATA FOR PEOPLE TO GAIN A SENSE OF THE HAZARD CONCERNS.
## I REPEAT, THIS IS NOT AN OFFICIAL DOCUMENT
## Sources
- EPA roving (Oct 21ā23) and continuous (Oct 21ā26) air monitoring summaries, MC Tank Release, via the [EPA response page](https://response.epa.gov/site/site_profile.aspx?site_id=17475)
- [City of Toledo: Hazmat evacuation in North Toledo (timeline and TAGA update, Oct 26)](https://toledo.oh.gov/news/2026/10/26/hazmat-evacuation-in-north-toledo)
- [City of Toledo: GMA Evacuation Return Guidance](https://cdn.toledo.oh.gov/uploads/documents/GMA-Fact-Sheet_Evacuation-Return-Guidance_10212026.pdf)
- [13abc: City announces chemical release complete](https://www.13abc.com/2026/10/22/toledo-chemical-leak-evacuation-zone-reduced/) and [evacuation order lifted](https://www.13abc.com/2026/10/23/investigators-city-leaders-hold-news-conference-giving-update-chemical-release/)
- [13abc: Toledo business owner sues over chemical release](https://www.13abc.com/2026/10/27/toledo-business-owner-sues-over-chemical-release/)
- [CBS News: Toledo resident describes chemical leak (symptoms, 35 patients at one hospital)](https://www.cbsnews.com/news/toledo-chemical-leak-evacuations-symptoms/)
- [WXYZ: Residents report irritated eyes and sore throats](https://www.wxyz.com/news/chemical-release-in-toledo-prompts-evacuations-shelter-in-place-orders)
- [City of Toledo / OSU Extension: Pet Owner Guidance](https://cdn.toledo.oh.gov/uploads/documents/Toledo_GMA_PetOwnerGuidance-17.pdf)
- [WTOL: residents with asthma could experience minor irritation](https://www.wtol.com/article/news/local/north-toledo-hazmat-situation-evacuations/512-23d84bbb-60fc-4c49-aaf4-57ca35a7f8c6)
- [Minnesota Dept. of Health: age-dependent adjustment factors (EPA early-life guidance)](https://www.health.mn.gov/communities/environment/risk/docs/guidance/adafrecmd.pdf)
- [Medical Daily: 60 treated after Toledo leak](https://www.medicaldaily.com/toledo-chemical-leak-glycidyl-methacrylate-symptoms-480291)
- [ACGIH TLV documentation: Glycidyl Methacrylate (2022)](https://www.acgih.org/wp-content/uploads/2023/04/Glycidyl_Methacrylate.pdf)
- [IARC Monographs Vol. 125 Q&A](https://www.iarc.who.int/wp-content/uploads/2019/11/QA_Monographs_Volume-125.pdf) (full monograph: [publications.iarc.fr/596](https://publications.iarc.fr/596))
- [Smyth et al. 1969, Range-finding toxicity data: List VII](https://doi.org/10.1080/00028896909343157)
- [Michigan EGLE 2006 screening level memo for GMA](https://www.deq.state.mi.us/Aps/downloads/ATSL/106-91-2/106-91-2_annual_24hr_ITSL.pdf)
- [TNO 1994: short-term high exposure to genotoxic carcinogens](https://publications.tno.nl/publication/34634418/dNixQE/verhagen-1994-risk.pdf)
- [AIDIC 2014: methyl methacrylate runaway calorimetry (CET vol. 36)](https://www.aidic.it/cet/14/36/019.pdf)
- [NIST enthalpy of vaporization for GMA, via Chemeo](https://www.chemeo.com/cid/60-074-3/2-Propenoic%20acid)
- [NOAA CHRIS: Glycidyl Methacrylate](https://cameochemicals.noaa.gov/chris/GCM.pdf)
- Erie St. PM2.5 (preliminary AirNow) and drone thermal data from a compiled data summary; [Ohio EPA network listing for the Erie St. monitor](https://dam.assets.ohio.gov/image/upload/epa.ohio.gov/Portals/27/ams/sites/2017/Appendix%20A-Network%20Descriptions.pdf)
- [ClickOnDetroit: Hazardous chemical release prompts evacuations near Ohio-Michigan border](https://www.clickondetroit.com/news/local/2026/10/21/hazardous-materials-release-prompts-evacuations-near-ohio-michigan-border/)
- [13abc: Hazmat crews responding to hazardous materials leak in North Toledo](https://www.13abc.com/2026/10/21/hazmat-crews-responding-hazardous-materials-leak-north-toledo/)