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Banyuwangi, situated on the easternmost tip of Java, Indonesia, occupies a strategically important coastal position facing the Bali Strait. Its coordinates, -8.2186, 114.3669, place it within a region characterized by a dynamic interplay of land and sea. The city’s terrain is predominantly undulating, transitioning from low-lying coastal plains to gently sloping hills inland, rising to approximately 150 meters above sea level in some areas. This varied topography influences local wind patterns and the dispersion of pollutants. Banyuwangi is bordered by the Indian Ocean to the south and the Bali Strait to the east, providing a crucial maritime link between Java and Bali. The surrounding landscape is a mosaic of agricultural land – predominantly rice paddies and clove plantations – interspersed with small villages and pockets of secondary forest. A significant urban–rural gradient exists, with denser urban development concentrated in the city center and gradually thinning as one moves towards the rural hinterland. To the west, the landscape rises into more substantial volcanic hills. The proximity to agricultural zones means that seasonal burning practices, particularly during land clearing for planting, can contribute to localized air pollution episodes. Furthermore, the Bali Strait’s influence moderates temperatures but can also trap humidity, impacting pollutant dispersion. While large-scale industrial belts are absent, smaller-scale industries, including fisheries processing and some light manufacturing, are present, adding to the potential for localized emissions. The city’s location at the edge of Java also means it is a major transportation hub, with increased vehicle traffic impacting air quality.

Banyuwangi’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality profile. The dry season, typically spanning from May to October, often sees a slight improvement in air quality due to increased wind speeds and more efficient pollutant dispersion. However, this period also witnesses increased agricultural burning, particularly in September and October as farmers prepare fields for the planting season. This practice releases significant particulate matter, leading to temporary spikes in localized air pollution. The wet season, from November to April, is characterized by higher humidity and frequent rainfall. While the rain helps to cleanse the atmosphere, the increased humidity can trap pollutants closer to the ground, especially during periods of reduced wind. Fog, common during the wet season mornings, further exacerbates this effect, creating stagnant air conditions. Temperature inversions, though less frequent than in temperate climates, can occasionally occur, trapping pollutants in a layer near the surface. During the wettest months (January-February), rainfall is generally sufficient to mitigate significant pollution build-up, but prolonged periods of overcast skies can still lead to elevated levels of certain pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be particularly cautious during agricultural burning periods and mornings with dense fog. Outdoor activities are generally more favorable during the drier months, but vigilance regarding agricultural practices is advised. The monsoon winds, while generally beneficial for dispersion, can occasionally bring in pollutants from neighboring regions.