The risk here is that such a radical ‘emancipation from the ground’, 54which reaches its apogee with the phenomenon of elite helicopter commuting in São Paulo, works to residualise the urban street – a space already under intense pressures from congestion, pollution, building and reduced public space and light penetration.

What does "light penetration" mean in this context?

The source: Vertical by Stephen Graham


reduced public space and reduced light penetration

Less daylight/sunlight reaches street level, presumably because of tall buildings.


Sunlight does not reach the street very often, and no light goes far.

 GPY's reply was promoted to an answer.