ozone
Coverage of ozone in the Nexus archive.
- How air pollution may affect fertility
A study in the Human Reproduction journal found that exposure to outdoor air pollutants like ozone and nitrogen dioxide during sperm development may alter DNA methylation in sperm, potentially affecting fertility and offspring health. Researchers identified 39 methylation changes linked to pollutants, including the gene GNAS associated with embryonic development.
- Denver ranked most polluted global major city in U.S. as wildfire smoke, ozone cloud Front Range
Denver was ranked the most polluted major city in the U.S. due to wildfire smoke and elevated ozone levels. An ozone action day alert is in effect for Colorado's Front Range Urban Corridor, with health officials warning against outdoor activity. Seven major wildfires are burning in Colorado, contributing to the pollution.
- Wildfire smoke, ozone hammer Colorado air quality
Wildfire smoke from Colorado and Utah is degrading mountain air quality, while the Denver metro area faces unhealthy ozone levels. The combination of wildfire emissions and elevated ozone poses significant air quality challenges.
- Air Quality Health Advisory issued in NYC
An Air Quality Health Advisory has been issued for New York City, Rockland, and Westchester counties due to ozone. The advisory, effective until 11 p.m. on Monday, urges individuals with cardiovascular and respiratory diseases, including asthma, to limit strenuous outdoor activity.
- Heatwaves and ozone together increase India’s cardiac deaths: study
A peer-reviewed study found that surface ozone levels in northern India during heatwaves reach 85-110 μg/m³, exceeding the WHO guideline of 70 μg/m³. In 2024, heatwaves were linked to approximately 830 additional cardiac deaths compared to non-heatwave days.
- Wildfires Are Reversing Years of US Air Quality Gains, Study Finds
A new study finds that wildfires have worsened ozone levels across the United States, reversing about four years of air quality progress. Tailpipe emissions standards had previously reduced smog levels, but longer, more intense fire seasons have erased much of that progress over the last decade.
- Wildfire smoke has reversed US progress toward ozone air quality, study finds
A study published in Science found that wildfires since 2015 have reversed US progress in reducing ozone levels, worsening air quality and public health. Wildfire smoke has increased emissions, undoing years of efforts to cut pollution.
- New report rankes the cleanest and most polluted U.S. cities
A new report ranks U.S. cities based on air quality, evaluating the presence of ozone and particle pollution. The study provides insights into the cleanest and most polluted urban areas across the country.
- Almost half of US population breathes unhealthy air: Earth Day report
The American Lung Association's Earth Day report reveals that nearly half of the U.S. population faces unhealthy air quality, with improvements in particle pollution offset by worsening ozone impacts.