I have posted about pollution issues/concerns a number of times previously on this blog site but it is worth remembering that such concerns go back a while. Have a look at this excellent Bootle mural.
It is on a former railway tunnel which is now a pedestrian walkway under Merseyrail’s New Strand Station. I have published photos of many of the other murals in this tunnel on this site and on my Flickr site in recent times.
Click on the photo to enlarge it.
The photo above is amongst those on my Flickr site at:-