Cimahi Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Cimahi is a compact urban enclave nestled within the highland plateau of West Java, Indonesia, positioned at an elevation of approximately 768 meters above sea level. This city functions as a strategic satellite to Bandung, lying just 10 kilometers to its south, within the Bandung Basin—a vast volcanic caldera surrounded by the Parahyangan Mountains. The terrain is characterized by rolling hills and valleys, which, combined with the city's dense urban fabric, creates a natural amphitheater effect that traps air pollutants. Cimahi's location in a basin exacerbates air quality challenges, as thermal inversions frequently occur, particularly during the dry season, preventing the dispersion of emissions from vehicular traffic, small-scale industries, and residential burning. The city is part of the Greater Bandung metropolitan area, a major industrial and educational hub, contributing to transboundary pollution from neighboring regions. While not directly coastal, its proximity to the Indian Ocean to the south influences humidity levels, but the surrounding mountains limit sea breezes, reducing natural ventilation. The urban–rural gradient is sharp, with Cimahi transitioning quickly into agricultural zones and tea plantations in the uplands, though these do little to mitigate the concentrated urban emissions. This geographic setting makes Cimahi particularly vulnerable to stagnant air conditions, leading to persistent haze and particulate accumulation, especially during periods of low wind activity.

Cimahi's air quality follows a distinct seasonal pattern shaped by the monsoon climate of West Java, with pollution levels fluctuating based on rainfall, wind patterns, and temperature inversions. During the dry season from June to September, air quality deteriorates significantly, peaking in August and September when reduced precipitation and frequent thermal inversions trap pollutants near the ground. These months see heightened particulate matter from vehicle exhaust, industrial emissions, and occasional agricultural burning in surrounding areas, making outdoor activities less advisable, especially for sensitive groups like children, the elderly, and those with respiratory conditions. The wet season from November to March brings relief, with heavy rains from the northwest monsoon scrubbing the atmosphere and dispersing pollutants, leading to cleaner air, particularly in December and January—ideal times for outdoor exercise. Transitional periods in April-May and October experience variable conditions, with sporadic rainfall and shifting winds causing intermittent haze. Sensitive individuals should monitor local air quality reports year-round, limit exertion during peak pollution months, and use masks when necessary. Fog is common in the early mornings, especially in the dry season, often mixing with pollution to reduce visibility and exacerbate health risks. Overall, planning outdoor activities for the wet season and avoiding the late dry season can minimize exposure to poor air quality in Cimahi.