Widespread poor air quality conditions across the majority of the eastern half of the United States were observed today (top left). As Graham and Ray mentioned this week, Colorado experienced particularly high PM2.5, especially near Boulder, peaking the Code Red, Unhealthy, levels (top right). Widespread cloud and snow cover across most of the United States today made aerosol optical depth (AOD) retrieval difficult and therefore not much to show (bottom left). Today's OMI NRT tropospheric NO2 satellite overpass shows increased NO2 in some of these areas including the Northeast, Mid-Atlantic, and Mississippi Valley (bottom right). In terms of winter weather, another crippling snow storm is forecast to impact the deep southeast states, before traveling along the eastern seaboard and potentially dumping significant snow across the Mid-Atlantic and Northeast (bottom). This forecast does not bode well for air quality conditions, as the persistent frigid conditions and potential power outages will only exacerbate the desire to burn wood for warmth.