Canadian wildfire smoke -- not ammonium nitrate -- is to blame for the orange-yellow haze seen over the United States this month, despite posts spreading online
, a professor of atmospheric chemistry at the University of Toronto, said an unusual air stream pushed the smoke west toward the province of Ontario before moving southeast., told AFP in an email that clear air usually contains small particles that scatter blue light, making the sky appear blue. Larger particles in wildfire smoke scatter red light, which can present as red, yellow or orange smog.
"The major thing that people are noticing is the scattering from the particles," Murphy said."That's light bouncing off of particles and making things look sort of darker and our visibility really decreases." Murphy said wildfire smoke can sometimes appear dark because some particles, such as brown and black carbon, can absorb light in addition to refracting it.says that since smoke can travel thousands of kilometers downwind from a fire, distant locations can be affected almost as much as those close by."Smoke from wildfires has affected millions of people in the US and Canada," Allen said."Large-scale weather patterns and the resultant winds can cause smoke to travel vast distances.
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