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Majene, situated on the southwestern coast of Sulawesi's West Sulawesi province, occupies a distinctive geographic position that significantly influences its air quality patterns. The city lies along the narrow coastal plain of the Mandar region, backed by the rugged mountains of central Sulawesi to the east, creating a natural amphitheater that can trap pollutants under certain meteorological conditions. At an elevation of approximately 10-50 meters above sea level, Majene faces the Makassar Strait to the west, which provides some marine ventilation but also exposes the city to seasonal maritime influences. The urban core, home to over 270,000 residents, represents a compact settlement surrounded by agricultural zones producing rice, corn, and coconut, with occasional biomass burning contributing to particulate matter. The city's position along the Palu-Koro fault system means occasional seismic activity but no significant volcanic pollution sources. Majene's air quality is primarily affected by local urban emissions from transportation, residential cooking, and small-scale commerce, with limited industrial activity. The coastal location allows sea breezes to disperse pollutants during daytime, but nighttime temperature inversions in the sheltered valley can concentrate contaminants. The surrounding mountainous terrain to the east creates a rain shadow effect, reducing precipitation that might otherwise cleanse the atmosphere, while the proximity to the equator ensures consistently warm temperatures that facilitate photochemical reactions year-round.

Majene's air quality follows distinct seasonal patterns driven by the Australian-Asian monsoon system, with pollution levels fluctuating according to wind patterns, rainfall, and agricultural cycles. During the northwest monsoon from December to March, prevailing winds from the Makassar Strait bring moisture and occasional rainfall, helping to wash particulate matter from the atmosphere, making this period generally favourable for outdoor activities despite higher humidity. The transitional months of April-May and October-November often experience the poorest air quality as wind speeds decrease and temperature inversions become more frequent, trapping vehicle emissions and occasional agricultural burning smoke in the coastal basin. From June to September, the southeast monsoon brings drier air from the Australian continent, potentially carrying dust and smoke from land clearing activities in southern Sulawesi, though ocean breezes typically moderate this effect. Sensitive groups including children, elderly residents, and those with respiratory conditions should be particularly cautious during the transitional periods when particulate matter concentrations peak, avoiding strenuous outdoor activities in the early morning when inversions are strongest. The absence of significant industrial pollution sources means health risks primarily stem from fine particulate matter rather than toxic gases. Visitors planning outdoor excursions should favour the northwest monsoon months when marine air provides natural ventilation, while carrying masks during transitional seasons when visibility occasionally decreases due to localized haze.