Relative merits & Pneumonia!
Yes there are some lovely things about Dubai and some awfull things about Dubai. Pros and cons like any place on Earth.
I believe the question was based on a move from HK and was for the health of a child. If this is a serious question then the serious answer is go to Europe, Australia, or even many parts of the USA. Many places that have clean air. Dubai does NOT.
Dubai does not have good air quality IF you are trying to improve the lung health of an infant or child.
For the record, I am a fit and active adult and I was diagnosed with Pneumonia in my first year in Dubai! Was this down to poor air quality? I'm not sure. But one thing I am sure about is that the air is not clean.
I am completely serious about this. I was very surprised to get so ill. I started with a cough and it just got worse and worse. I was off work for some time. As I talked to other people I was surprised to find others who had also been affected with poor lung health and even pneumonia.
So, it may be better than HK but its not good.
The moon is a warm place, compared with Pluto.