After all, the water quality in Shanghai is softer than that in most northern areas, and there are not many mineral ions, so the skin will become more delicate, but not necessarily whiter. This mainly depends on my skin and sun exposure. Shanghai is basically in the mid-latitude region, so the atmosphere will be thinner on the way of sunlight entering the northern region, especially in summer, and the ultraviolet intensity will be slightly higher. But since it is a big city like Shanghai, automobile exhaust will also help to block ultraviolet rays. In short, you should take sunscreen measures before going out in midsummer, and don't run around casually.