Global Scans · Ozone depletion · Weekly Summary

A global catastrophic risk is a hypothetical future event that has the potential to damage human well-being on a global scale. Some events could cripple or destroy modern civilization. Any event that could cause human extinction is known as an existential risk.

• Ozone: 8-hour average Ozone concentrations in the Good (AQI Green) to Moderate (AQI Yellow) range are expected; with a few locations possibly reaching the low-end USG (AQI Orange) range. West Michigan Clean Air Coalition
• Ozone: 8-hour average Ozone concentrations in the Moderate are expected with the possibility for Unhealthy for Sensitive Groups (USG - Orange AQI). West Michigan Clean Air Coalition

Last updated: 21 September 2026