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Code Orange Air Quality Alerts in Effect for Allegheny County and South-Central Pennsylvania Through This Evening

Officials cite a temperature inversion with light winds trapping fine particles near the ground.

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Stagnant Air Prompts Ongoing Advisories in Oregon, Idaho and Arizona

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

Oregon Valleys Under Air Stagnation Advisory Through Sunday Morning

South Coast AQMD Extends No-Burn Order as NWS Keeps Air-Quality Alerts Through Monday

L.A. County Air Quality Alert Extended Through Tuesday as No‑Burn Order Continues

Air Quality Alerts and No-Burn Order Stretch Across Southern California Through Monday

Ozone Action Day Expands to Austin as Air Quality Alerts Hit Four Texas Metros

Delta Breeze and Marine Layer Bring Cool Down to Northern California

Canadian Wildfire Smoke Triggers Statewide Air Quality Alert in Minnesota

Canadian Wildfire Smoke Sustains Unhealthy Air Quality in Midwest and Northeast

Canadian Wildfire Smoke Extends Air Quality Alerts Across Midwest and Northeast

Midwest Remains Under Air Quality Alerts as Canadian Wildfire Smoke Lingers

Wildfire Smoke Triggers Widespread Air Quality Alerts Across Upper Midwest

Northern California’s Interior Hits Hottest Temperatures of the Year as Triple-Digit Heat Persists

High-Pressure Ridge Drives Brief Midweek Heat Surge in California

Hazy Heat in New England to Yield to Cool, Rainy Weekend

Rain Eases Drought in Chicago as Fog and Wildfire Haze Linger

Northeast Ohio Heats Up to Mid-80s Ahead of Storm Threat

Chicago to Heat Up Near 90°F Before Showers and Midweek Cooldown