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Key Facts
- Low "Good" Air Quality: Only 5% of the world's population has been exposed to "Good" ozone levels that fall within World Health Organization (WHO) safety guidelines.
- Regional Breakdown:
- Asia: Most impacted globally, with 60% of its population facing extremely high levels (rising to 90% when including poor and very poor levels).
- Europe and North America: Follow Asia as the next most affected regions, with North American progress hindered by extreme heat, climate change, and wildfires.
- Oceania: Ranks as the cleanest region, with 100% of the population experiencing good or fair levels.
- Causes: Ground-level ozone is a toxic gas (and a main component of smog) formed when sunlight and extreme heat trigger chemical reactions between nitrogen oxides, volatile organic compounds, and other pollutants from industrial emissions, transport, and wildfires.
- Impacts: It damages human respiratory health, harms ecosystems, and reduces agricultural crop yields.
Would you like to know more about how ground-level ozone affects health or what steps cities are taking to reduce smog?
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Sep 29, 2026 — Nearly 40% of global population exposed to dangerous ozone pollution in 2026: Report. Ground-level ozone harms human health, ecosystems and crop ...
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