Malaria is rife even in the city of Luanda. Always have protection against mosquitos. It is particularly bad during the rainy season. If you need to wear shorts because of the heat and humidity, you are advised to take precaution against malaria.
If you are staying in Luanda only for a short term, take propylactics.
Luanda airport is full of mosquitos and you need to take this threat very seriously indeed. Don't even think about travelling to Luanda without taking malaria medication. You will need to have some sort of masquito spray ( DEET preferrably) or anti- insect wipes. I would also suggest that you take some toilet paper because if you ARE forced to use the toilets at the airport, there is no toilet paper.