The phrase "middle latitudes" refers to the areas on Earth that are located in between the equator and the poles. It includes regions with temperate climates, not too hot or too cold. Full definition
In the positive phase the pressure is low at the pole and high at middle latitudes. (climatecrocks.com)
Work then will also focus on studying to what extent chlorine - activated and ozone - depleted air masses will make its way into the densely populated middle latitudes. (sciencedaily.com)
In the negative phase the pressure is not as low at the pole and not as high at middle latitudes. (climatecrocks.com)