If there was any doubt that the spring and early summer air is saturated with pollen then this should clear things up.
A few days back we had very light rain. Light rain does not wash everything away in one fell swoop, and it allows you to see just how much pollen is on the surface of all the things around you. Here you will see the yellow in the edges of the water as it is washed away in to the gutter system. Apologies for not getting closer to the ground. The lens on my 30mm is not macro and thus need to be at least arms length from the subject being photographed.
Another way to see the pollen is to just swipe your finger over something that has been standing outside for a day or so and you will notice the yellow line on your finder.