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Air Quality

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WHO Warns ‘Black Rain’ After U.S.-Israeli Strikes Poses Acute Health Risk in Tehran

Limited testing leaves the scale of contamination uncertain across the Tehran basin.

Black Rain Falls Over Tehran After Strikes on Oil Depots

Bowser Releases Delayed D.C. Congestion Pricing Study, Rejects $10 Downtown Charge

San Francisco Rallies Against Mayor’s Near-80% Cut to Environment Department

Health and Environmental Groups Sue EPA Over Repeal of Greenhouse-Gas ‘Endangerment Finding’

Air Quality Alerts Cover Capital Region and Mohawk Valley Through Thursday Night

Massive U.S. Study Links Fine-Particle Pollution to Higher Alzheimer’s Risk

British Heart Foundation Warns Wood-Burner Pollution Can Linger in Blood for Months

Canary Islands Declare Pre-Alert as Dense Saharan Dust and Strong Winds Degrade Air Quality

Philadelphia Issues Smoke Advisory for Grays Ferry After Transfer-Station Fire

Trump Revokes EPA Endangerment Finding, Unraveling U.S. Climate Rules

Delhi–NCR Fast-Tracks Grid Air Monitoring: 27 Stations Underway, 46 Proposed

Germany Warns of Winter Radon Surge, Urges Home Testing

Hoy No Circula Suspended This Sunday in CDMX, Edomex and Toluca Metro Areas

Science Study: COVID Lockdowns Weakened Methane Sink, Fueling Early‑2020s Surge

NYC’s 2001 Memo Anticipated 35,000 9/11 Exposure Claims, Prompting New Demands for Records

Winter Smog Persists Over Eastern and Northern Germany, With PM Limits Breached in Saxony and Lower Saxony

Smoke From Smoldering Putnam County Wildfire Closes Roads, Disrupts Schools

Bombay HC Names Retired Judges to Lead High-Powered Panel on Mumbai Air Pollution

Southern California Air Quality Alerts in Effect as No-Burn Rule Is Enforced