What is 'Optical Pollution' ?.
I think the manner in which the outside units are fitted (particularly on new buidings) are a prime candidate for such a title.
Whereas the function of air-conditioning is necessary in many cases, why do they have to be fitted in such an unsightly fashion ?.
In some cases (where the units are at 'Gound Level') they can be quite dangerous (especially after a few drinks !).