Environment ❯ Air Quality ❯ Pollution

Particulate Matter

PM2.5 Health Effects PM10 Health Risks PM2.5 and PM10 PM 2.5 PM2.5 Levels AQI Wildfire Smoke Wildfires

Hoy No Circula Uses Second‑Saturday Rules Across Mexico City Area on March 14

Acceptable air quality kept the program on its standard second‑Saturday schedule without contingency restrictions.

Johannesburg’s ‘Rotten-Egg’ Odor Persists as Monitors Log Hydrogen Sulphide Spikes

Ghaziabad Leads 2025–26 Winter Pollution Rankings as CREA Reports Worsening PM2.5

Hoy No Circula Returns to Regular Third‑Saturday Rules as Air Quality Improves in Mexico City Region

Code Orange Air Quality Alerts Remain in Effect Across Southeastern and Central Pennsylvania

Hazardous Dust in California’s Imperial Valley, Orange PM2.5 Advisories in Tuxtla and New York City

Philadelphia Launches Breathe Philly, Citywide Real-Time Air Quality Network

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

Code Orange Air Quality Alerts Continue in Parts of Pennsylvania, Extending Into Thursday in Some Areas

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

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

Bay Area Issues Thursday Spare the Air Alert, Bans Wood and Solid-Fuel Burning

Hoy No Circula: Monday, Feb. 2 Rules Hold Steady in Mexico City and Edomex

Germany Records Widespread PM2.5 Breaches as Rain and Wind Bring Partial Relief

Saturday Hoy No Circula Enforced Across Mexico City, Toluca and Tianguistenco as Air Quality Turns Poor

Study Finds Home Wood Heating a Major Winter Polluter Linked to 8,600 U.S. Deaths

Germany Faces Weekend of Poor Air as UBA Issues Health Warning

California PM2.5 Alerts Persist as Riverside and Orange Counties Remain Unhealthy for Sensitive Groups

California Air Quality Alerts Persist as 'Unhealthy' PM2.5 Prompts Stay-Home Guidance

Salt Lake City Leads U.S. Air Pollution for Second Day as Inversion Persists