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Pati, located in Jawa Tengah, Indonesia, occupies a geographically significant position within the North Coast of Java. Situated at approximately -6.7415° latitude and 111.0347° longitude, the city’s terrain is predominantly flat, characteristic of the coastal plains of Java. Its elevation is relatively low, averaging around 10 meters above sea level, contributing to a humid, tropical climate. Pati lies close to the Java Sea, a major influence on local weather patterns and a potential source of marine-derived pollutants, though typically less impactful than terrestrial sources. The surrounding landscape is a mosaic of rice paddies, coconut plantations, and small-scale agriculture, forming a gradual urban-rural gradient extending outwards from the city center. To the west, the landscape rises gently towards the interior of Jawa Tengah, while to the east, it remains largely flat, bordering the coastal lowlands. Industrially, Pati is part of a broader regional belt experiencing growth, with some light manufacturing and food processing industries present, contributing to localized pollution. The city’s proximity to Semarang, a major industrial and port city approximately 150 km away, means it can be affected by transboundary pollution events, particularly during periods of stagnant air. The flat topography and limited natural barriers exacerbate the potential for pollutant accumulation, especially during periods of reduced wind speed. The extensive agricultural activity, while vital to the regional economy, also introduces agricultural emissions, including ammonia and particulate matter, into the local air quality profile.

Pati’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality. The dry season, typically spanning from May to October, often sees a slight improvement in air quality due to increased wind speeds and more frequent rainfall events that naturally cleanse the atmosphere. However, this period also witnesses heightened agricultural burning in surrounding areas as farmers prepare fields for planting, leading to spikes in particulate matter pollution. The wet season, from November to April, brings consistently higher humidity and frequent rainfall, but also prolonged periods of reduced wind speeds and occasional fog, particularly during the transition months. These conditions can trap pollutants near the ground, leading to periods of poorer air quality. Temperature inversions, where cooler air settles below warmer air, are more common during the wet season, further hindering vertical mixing and exacerbating ground-level pollution. Months like January and February often experience the most stagnant air conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor exertion and monitoring for any adverse health effects. While rainfall helps to clear the air, the associated humidity can also exacerbate respiratory issues for some. During the dry season, minimizing exposure to smoke from agricultural burning is crucial. Overall, air quality in Pati fluctuates considerably throughout the year, driven by a complex interplay of meteorological factors and human activities.