Our proof of principle city has been subject to a curious natural phenomenum, inversion. This produced 4 days of compressed air pollution due to a layer of warm air pressing on top of the lower layers. The compression causes the general air pollution to temporarily concentrate at respiration level. When the inversion takes place again then the pollution suddenly seems to disappear.
Below you find an animation made by one of our cooperative partners. You can see the wing of warm air travel over the wave of cold air. The small dotted lines represent the fine dust compression and expansion. Above you can see the wave in measured values. The high lasting peak sudden shows a fast down fall in measured particle density or presence.