Why is nighttime burning discouraged?
In the evening, especially in the fall, a “shallow atmospheric inversion” often sets up. Air close to the ground cools quickly at night and smoke is trapped and unable to disperse. Smoke nuisance and health impacts are usually reduced by daytime burning when there is more air movement and better smoke dispersion. However, care must be taken to contain the fire within the field and to ensure that smoke does not drift onto highways or over to neighbours.
