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Bari, the capital of Puglia in southeastern Italy, occupies a distinctive coastal position on the Adriatic Sea, with its urban core situated on a low-lying promontory that creates a natural harbor. This geography profoundly influences its air quality dynamics. The city lies within the Apulian Plain, a relatively flat agricultural region known for olive groves and vineyards, which transitions into urban density towards the coast. Bari's elevation averages just 5 meters above sea level, with minimal topographic relief to disperse pollutants, making it susceptible to stagnation under certain meteorological conditions. The Adriatic Sea to the east moderates temperatures but can also trap emissions when sea breezes recirculate air inland. While Bari lacks heavy industrial belts like northern Italian cities, it functions as a regional economic hub with port activities, vehicular traffic from its dense urban fabric, and some light manufacturing contributing to general urban pollution sources. The urban-rural gradient is sharp, with the metropolitan area blending into peri-urban zones and then the agricultural hinterland, where occasional biomass burning from agricultural residues may add particulate matter. Proximity to the sea generally aids dispersion, but during anticyclonic conditions, pollutants from local traffic, residential heating, and port operations can accumulate, particularly in the compact historic center with its narrow streets limiting ventilation.

In Bari, air quality follows a distinct seasonal rhythm shaped by Mediterranean climate patterns. Winter, from December to February, often sees the highest pollution levels due to increased use of residential heating systems, which emit particulate matter and nitrogen oxides, combined with frequent temperature inversions that trap pollutants near the ground. Calm winds and stable high-pressure systems exacerbate this, making late winter mornings particularly poor for outdoor activities. Spring, from March to May, brings improvement as temperatures rise, reducing heating needs, and more frequent winds from the Adriatic help disperse emissions; this season is generally favourable for outdoor exercise. Summer, from June to August, experiences lower pollution from heating but may see spikes in ozone due to intense sunlight reacting with vehicle emissions, especially during heatwaves when stagnant air prevails. Sea breezes typically provide relief, but sensitive groups like asthmatics should avoid strenuous activity on hot, still afternoons. Autumn, from September to November, transitions with decreasing temperatures and rising heating use, leading to a gradual increase in pollutants, though it remains milder than winter. Throughout the year, sensitive individuals—children, the elderly, and those with respiratory conditions—should monitor local air quality reports and limit exposure during peak winter months and summer ozone episodes, opting for indoor activities on days with poor dispersion.