Too many nats

Yuma, AZ(Zone 10a)

I know they are nats but I have no idea if they are harming my petunias and marigolds and other flowers there is a white powdery substance left on the petals

Thumbnail by NikkieMa1
Minot, ND

I cannot see anything identifiable as an insect in this image. Could the powdery substance be pollen?

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