Several locations within the MId-Atlantic and Northeastern US experienced Code Yellow (Moderate) and Orange (Unhealthy for Sensitive Groups, USG) ozone AQI levels, as shown in EPA Airnow AQI animation below. High Temperatures and humidity were the controlling factrs to the…

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Code Yellow and Orange Ozone AQI Levels over the Mid-Atlantic and Northeastern States; Wildfire smoke over North Dakota and California from Canadian…

National air quality is fairly uneventful today with the exception of Southern California, where seasonal Code Orange (Unhealthy for Sensitive Groups) ozone conditions occurred in the Los Angeles metropolitan region (below on left). Elsewhere, air quality is Code Green (Good)…

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Code Orange Ozone in Southern California; Code Yellow O3 and PM2.5 across Great Lakes and Mid-Atlantic Regions

The maps below left and right illustrate that Ozone and PM2.5 for Thursday remains in the good to moderate levels across continental US. California shows some indications of moderate PM 2.5. AirNOW reported unhealthy Air Quality in southeastern Texas. Canadian…

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Fires continue in Canada and good to moderate AQI in US

The fires in the Nunivut, Canada, continue to pour smoke southwards into the US. Last night visible smoke was seen over Baltimore as a 3-4km layer on the UMBC Leosphere lidar and later subsided down into the PBL. By six…

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Canadian Fires dominate East Coast Air Quality

A blowing dust advisory for western and southwestern Colorado was issued by the Colorado Department of Public Health and Environment, as strong gusting ( 40 to 50 mph) winds were expected to blow across dry areas of Colorado, Arizona, and…

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Blowing Dust Advisory and Ozone Air Quality Action Day in Colorado; Haze and Moderate PM2.5 in Southeastern US