Accumulation post dispersion is also a thing. If the combined effects of individually harmless activities was not an issue, this comment thread wouldn't exist.
> During the cooler winter months, more than one-third of particulate pollution comes from wood smoke. On some days, in certain areas, wood smoke can account for up to 90 percent of particulate pollution.
> On cold, calm days, wood smoke can become trapped close to the ground by an inversion layer, typically formed when a layer of warm air acts as a lid over a layer of cooler air. Inversions prevent the air below from rising, which causes pollutants to build up.