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A big worry indeed, as you are right. To gauge the health of an area, one has to look at the insect life.
Since we moved down there to the Western Cape, the air is clear and that is a big bonus.
I think that electrical cars are going to grow in popularity, but the problem is that they are not only expensive, but they are also limited in travel distances.
In town it's not a problem, but to drive from Cape Town to Johannesburg is going to be dicey.