Here are a few contributions that I made myself. I'll be posting more as I do them, primarily to give people ideas. The first one is a 2.5 cm square wood sculpture (wood burning is a major source of PM), then a 2.5 cm diameter ball of steel wool and twine (represents industry). The next two pieces are 2.5 cm square and 10 cm square laminated actual PM10 samples taken from Sacramento, CA (smaller one) and Calexico (larger one).
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