A persistent weather system continues to bring smoke from Canadian wildfires through the Chicago area:
You may have been wondering about the recent vibrant, reddish sunsets and hazy skyline in Chicago. What’s behind these phenomena can be traced back to a combination of particulate matter and smoke from Canadian wildfires and pollutants that create ground-level ozone.
While the red sun and milky-looking skies might give the city an otherworldly, even awe-inspiring appearance, Chicagoans — especially those with respiratory or pulmonary disorders, as well as active children and adults — should take precautions.
Because blue light has the shortest wavelength, it’s scattered the most effectively. But a high concentration of particulate matter in the air, which may travel from faraway fires carried by the wind, allows longer wavelengths of orange and red light to scatter around as well. Recent dust storms have also caused vibrant, colorful sunrises and sunsets in the state as well.
Right now at Inner Drive Technology World Headquarters, our outside weather station shows an AQI of 40, with pm2.5 the primary pollutant. So at least for now, the smoke isn't reaching the ground. But I only have to look out the window to see what NOAA sees from space:
