European wasps can be very aggressive and with their nests reaching up to 100,000 individuals, they can be a serious safety concern. As their nests are often built underground there is no way of knowing how big the nest is, which is why wasp control is best tackled by a professional.
Paper wasps produce a lot smaller nests and are less aggressive, but nevertheless they can deliver a painful sting and nests should be removed before they get too large.