Circulation patterns influencing the concentration of pollutants in central Mexico

In this study, weather patterns producing circulation features that result in poor air quality the Mexico City basin during dry season (November–May) were examined. Cluster analysis of 500-hPa winds for a 30-year period (1990–2019) identifies set are then used to explore daily anomalous concentrations ozone, nitrogen dioxide, and particulate matter. Above-normal levels pollution occur under influence mid-troposphere high pressure system centered around 20°N shifts eastward over Mexico. This pattern is characterized by below-normal cloudiness, greater solar radiation, weaker surface winds, stronger morning temperature inversion persists later than normal. High events associated with preferentially season: March–May O3, December–February NO2 PM2.5. PM10 occurred evenly throughout season. At interannual scale, El–Niño–Southern Oscillation related frequency pollution-related patterns: La–Niña (El–Niño) years favor occurrence more (less) work reveals seasonality predictability atmospheric basin, which can be assessments at both seasonal intraseasonal scales.