North Thames side atmosphere mid tide waves

This section of the Thames footpath passes under bridges and follows narrow lanes. The air conditioning in the adjacent buildings gives a unchanging airy drone - essentially a constant sonic fog - which envelopes all other sounds. When the tide is down waves on the beach are heard, as are more distant traffic, sirens or planes. Right behind me is one air conditioning outlet. Others are either side. The view is potentially interesting, but it is not a place to linger.