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.

• [New] We can avoid 0.6 °C of warming by 2050 by tackling super pollutants, such as methane, black carbon and tropospheric ozone, while reducing carbon dioxide emissions. Health Policy Watch
• [New] For air quality, with surface temperatures reaching the 80s, coupled with light winds, Ozone may pose a threat with concentrations reaching the high-Moderate range in both southwest and southeast Michigan, with the possibility of an hourly concentration in the Unhealthy for Sensitive Groups range. West Michigan Clean Air Coalition
• [New] Starting with tomorrow, winds become light over southeast Michigan, especially metro Detroit, which may pose a threat for Ozone development. West Michigan Clean Air Coalition
• [New] Ozone concentrations are expected to be in the Moderate to hourly Unhealthy for Sensitive Groups (Orange AQI) range. West Michigan Clean Air Coalition
• [New] As parts of Europe remain gripped by a deadly heatwave, experts warn that high temperatures, intense sunlight and stagnant atmospheric conditions create favourable conditions for ozone formation during the summer period. Euronews
• [New] Rising temperatures due to climate change are expected to increase ozone formation frequency and intensity across Indian cities. Legacy IAS Academy
• [New] We find that achieving 1.5 °C goal could expedite guidelines by decades, dropping PM2.5 to 5 µg m and ozone to 30 parts per billion by volume by 2050, averting over a million mortalities and delivering major benefits in India, China, American, Europe, and Southeast Asia. Nature
• [New] The global population-weighted PM2.5 concentration would be close to 5 µg m by around 2050, while ozone would be around 30 ppbv in 2060. Nature
• Ground-level ozone remains one of the most persistent threats to air quality in urban America. Hindustan Times
• The EPA will no longer consider the economic cost of harm to human health from fine particles and ozone, two air pollutants that are known to affect human health. NPR
• A relatively small nuclear war between India and Pakistan could do just as much damage to the ozone layer as a larger nuclear war between the US and Russia. Electricity Info
• A nuclear war between India and Pakistan could destroy the ozone layer. Electricity Info
• What the authors found is interesting: UV radiation flooding out from an active galaxy could actually promote the growth of protective ozone in a planet's atmosphere, assuming there's enough oxygen available to make it. Scientific American
• Most regions meet the AQGs for ozone after 2070, significantly later than PM2.5. Nature
• By 2100, the global population-weighted annual PM2.5 and ozone would be 13 µg m and 37 parts per billion by volume under the SSP2_baseline scenario, which lie significantly higher than the AQGs. Nature
• Particulate matter and ozone are potent health hazards-in fact, they are criteria pollutants regulated by EPA - and more commonly associated with vehicle and industrial emissions, but their potential generation by biopesticides must be considered. Beyond Pesticides Daily News Blog
• The Environmental Protection Agency (EPA) will stop calculating the economic cost of harms to human health from emissions of ozone and PM2.5 - airborne fine particulate matter that is 2.5 micrometers or smaller. JD Supra

Last updated: 03 August 2026