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Siaton occupies a strategic position on the eastern coast of Negros Oriental, where the fertile plains of the lowlands meet the imposing elevations of the island's central mountain range. This geographic duality creates a distinct urban-rural gradient, with the municipal center clustered along the coastline while the interior transitions into rugged, forested highlands. The town is cradled by the Tañon Strait to the east, a critical marine corridor that regulates local temperatures and provides a consistent influx of maritime breezes. These winds act as a natural ventilation system, flushing out pollutants from the residential core and maintaining relatively fresh air along the shore. However, the inland terrain, characterized by undulating hills and steep slopes, can lead to localized atmospheric stagnation. In these higher elevations, temperature inversions may occasionally trap particulate matter, particularly during the cooler months. The surrounding landscape is dominated by vast agricultural zones, primarily coconut plantations and cornfields, which introduce biological aerosols and organic compounds into the atmosphere. Unlike the industrial hubs of Dumaguete or Bacolod, Siaton lacks heavy manufacturing belts, meaning its air quality profile is driven primarily by biomass burning and transport emissions along the main arterial roads. The interaction between the coastal humidity and the mountain breezes creates a complex microclimate where air pollutants are often dispersed rapidly toward the sea, though they may linger in the narrow valley pockets before reaching the coast. This seamless blend of maritime influence and montane topography ensures that Siaton remains a breathable enclave within the province.

Siaton's air quality follows a binary tropical rhythm, oscillating between the distinct wet and dry seasons. From December to May, the dry season prevails, driven by the Amihan, or northeast monsoon. During these months, the air is generally clearer due to strong winds, but the lack of precipitation allows particulate matter from agricultural residue burning to accumulate. Peaks in pollution typically occur between February and April, when farmers clear land for new planting cycles. During these peak dry periods, sensitive groups, including children and the elderly, should limit strenuous outdoor activities during the midday heat to avoid respiratory irritation from smoke and dust. Transitioning into the wet season from June to November, the Habagat, or southwest monsoon, brings heavy rainfall and increased humidity. These rains act as a natural scrubbing mechanism, washing pollutants and aerosols from the sky, leading to the cleanest air of the year. However, the high humidity of the wet season can exacerbate the feeling of air heaviness and promote fungal spores, which may affect those with asthma. The most favorable months for outdoor excursions are typically November and December, when the air is crisp and rainfall begins to subside. To maintain health, residents are encouraged to monitor local smoke haze during the harvest months. Overall, the meteorological cycle ensures that while seasonal spikes exist, the pervasive influence of the sea keeps the air quality within a manageable range. Additionally, those living in the highlands should remain mindful of early morning valley mists that can trap pollutants.