Berastagi Air Quality Index (AQI)

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Berastagi, nestled in the Karo Regency of North Sumatra, Indonesia, occupies a strikingly volcanic landscape. Situated at coordinates 3.1833, 98.5167 and a population of approximately 48,244, the city is dramatically defined by its elevation – around 1,300-1,500 meters above sea level – on the slopes of Mount Sinabung and Mount Sibayak. This high-altitude position significantly influences air quality, creating conditions conducive to temperature inversions. The surrounding terrain is characterized by steep hills, lush agricultural lands, particularly fruit and vegetable farms, and dense tropical rainforest. Berastagi benefits from relatively high rainfall due to its elevation and proximity to the Barus River and other smaller waterways that drain the volcanic slopes. While not heavily industrialized, the region supports small-scale processing of agricultural products. The urban-rural gradient is sharp; the city centre is compact, quickly transitioning to agricultural fields and forested areas. The volcanic activity, while providing fertile soil, is a key source of particulate matter, impacting local air quality. Prevailing winds often carry ash and gases from Sinabung towards Berastagi, exacerbating pollution events. The city’s location within a valley also limits air dispersion, trapping pollutants.

Berastagi experiences a tropical monsoon climate, rather than distinct seasons, but air quality fluctuates significantly with the wet and dry periods. The dry season, generally from June to September, sees the worst air quality. Reduced rainfall means less atmospheric cleansing, and increased agricultural burning for land preparation releases substantial smoke and particulate matter. Volcanic activity from Mount Sinabung is also more noticeable during drier conditions, as ash isn’t quickly washed away. Temperature inversions, common at this altitude, trap pollutants near the ground. October to May constitutes the wet season, bringing relief from pollution. Heavy rainfall effectively scrubs the air, reducing particulate matter concentrations. However, increased humidity can promote mold growth, potentially impacting respiratory health. November and December often experience intense rainfall and localized flooding. February and March can be particularly foggy, reducing visibility and potentially trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in August and September. Wearing masks (N95 or equivalent) is advisable. During the wet season, while air quality is generally better, monitoring for mold and dampness indoors is crucial.