Understanding high polluted events in a tropical megacity with air quality observations and ERA5-reanalysis data

Already published studies found that 20% of the atmospheric pollution variations are linked to local meteorology. This relationship may be more important in places with dense populations such as Latin American cities since topography and fast multiscale changes part tropical climate. Even so, this possibility has not been addressed previous studies. research aims characterize between climate variables PM2.5 levels during high events. The wind field, Turbulent Kinetic Energy (TKE), radiation, temperature, relative humidity, boundary layer height, stability concentration was investigated. Statistical correlations parcel method were used analyze vertical motions PM2.5. Obtained results show stability, velocity, height do significantly affect levels. We identified some signals strongly related concentrations: weaker than average horizontal speed TKE throughout day, easterly winds morning (associated transport ashes from wildfires produced on Eastern plains), combined a higher radiation peak. These lead better understanding variations, which can applied for improvement air quality models have potential novel policy manage risk.