We have had a long period of dry, sunny weather The exception was Sunday night when we had two 5 minute thunderous, heavy rain showers. It has since returned to sunny weather.
In consequence, the pollen that was in the air was washed down by the rain, and concentrated in puddles on the roads. The water has now evaporated away, leaving lines of yellow pollen everywhere.
I don't know the source of the pollen, but, judging by the quantity I suspect it is from trees.
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