Urban air cleaning vegetation towers

Every time I ride my bike to the morning prayers I get of view of our coastal towns, and there's a black line in the air just above them and all along the coast. On Saturday (the biblical Sabbath day) it gets a little thinner, and after rainy winter days, the thin blue line which is the sea can be observed. Once a year on Yom Kippur the black line completely disappears and only the blue sky is seen along with the thin blue line of the sea.

When I visit Tel Aviv coming down Hamasger St. the bus route and the home of endless engine fixing workshops, I cannot but notice the plants covered with black soot. They are away from the road, and the walls nearby are much less affected. This seems to show that plants tend to pull in soot, besides the known fact that they emit O2 when in the light.

So the proposed idea here is to create tubes from transparent mesh screen material with plants in them transparent to light in the daytime and lit by LEDs at night, their air would flow through them until cleaned and O2 would flow out, cleaning up the city without taking up the space that vegetation usually does, by attaching them to the light posts and to bare building walls. part of the tube can be made of transparent plastic, so that it looks good, but doesn't let insects in.

To avoid light polution the led section could be in non- transparent sections of the tubing.