PBL (Planetary Boundary Layer)

The Planetary Boundary Layer (PBL) is the lowest part of Earth's atmosphere directly influenced by the surface, typically extending up to about 1 to 2 kilometers. It responds quickly to changes like surface heating, humidity, or pollution sources. Within this layer, air mixes rapidly due to turbulence caused by features like terrain, buildings, or weather conditions. The PBL plays a key role in weather patterns, pollution dispersion, and climate interactions, acting as the interface where surface processes impact atmospheric processes and vice versa, shaping daily weather and air quality experiences.