Most likely due to its colonization by Europeans.
Answer: Thermal inversion
Explanation: Thermal inversion or change the position of the air layer, when the warmer layer of air is above the cold layer, which is usually not the case. It happens due to a change in the normal temperature gradient, i.e. when the gradient becomes inverted. Such thermal inversions can occur in oceanic areas with a lot of upwelling near the coasts. Thermal inversion also occurs when sun radiation is less than radiation from the earth, which is the case during the night. The significance of these inversions is great, especially for air quality in polluted environments such as urban. The strongest inversions are during the winter and can then be dangerous due to poor air quality, which is measured by the AQI (Air Quality Index). The higher the AQI index, the greater the risk of bad air, that is, the worse air.
One of the main reasons why some areas to the east of the pacific mountain ranges are having a desert climate is that the "<span>air loses much of its moisture as it moves from the pacific ocean eastward up the mountains." In addition, the significant influence of the Pacific Ocean proved to be a factor for desertification among these lands as it moderates temperature extremes.</span>
