Today we drove from CABA to Mar Del Plata and stopped 3 times along the road. It was IMPOSSIBLE to stay outdoor with short trousers/sleeveless shirt. They are in great numbers and bite you even under the hot sun.
Last night I wasn't able to stay on our terrace at night, too many of them. It is usually a very occasional nuisance.
No mosquitos can withstand the strong ocean breeze in mar del plata, thank god!