The Weather–Pollution Connection
Weather is one of the most powerful forces shaping air quality. Wind speed, temperature, humidity, and atmospheric pressure all influence how pollutants disperse — or accumulate.
Temperature Inversions
Normally, warm air rises and carries pollutants upward. During a temperature inversion, a layer of warm air sits above cooler air near the ground, trapping pollutants close to the surface. These inversions are common on calm, clear winter nights and can cause AQI spikes lasting days.
Wind and Dispersion
Strong winds dilute pollutants by spreading them over a larger area. Conversely, calm or stagnant conditions allow pollution to concentrate. Coastal cities often benefit from sea breezes that push inland smog away.
Rain as Nature's Air Filter
Rainfall physically washes particulate matter out of the atmosphere — a process called “wet deposition.” That fresh, clean smell after rain (petrichor) is partly the result of cleansed air.
What You Can Do
Monitor both the weather forecast and the AQI together. On high-pressure, low-wind days, consider moving your workout indoors.
