Mojokerto Air Quality Index (AQI)

Loading live AQI data...

Loading weather snapshot...

Loading historical AQI trends...

Mojokerto, situated in Jawa Timur (East Java), Indonesia, occupies a geographically significant position within the island’s eastern heartland. Located approximately 40 kilometers southwest of Surabaya, Indonesia’s second-largest city, Mojokerto acts as a vital regional hub, experiencing a gradual urban–rural gradient as one moves outwards. The city’s coordinates (-7.4722, 112.4336) place it within a relatively low-lying area, averaging around 170 meters above sea level, contributing to potential temperature inversions, particularly during drier periods. The surrounding landscape is characterized by a mix of fertile agricultural plains and gently rolling hills, indicative of the volcanic terrain common to Java. To the north, the Brantas River provides a crucial water source and influences local microclimates. The proximity to Surabaya, a major industrial and port city, is a key factor impacting Mojokerto’s air quality, as industrial emissions and vehicular traffic from Surabaya can readily drift into the region. Furthermore, the surrounding agricultural zones, while vital for the regional economy, can contribute to air pollution through the burning of agricultural waste, especially during harvest seasons. The city’s urban character is a blend of traditional Javanese architecture and modern development, with a growing population density impacting local air quality through increased vehicle usage and domestic fuel consumption. The terrain, while not dramatically mountainous, does create localized valleys where pollutants can accumulate, especially when wind speeds are low.

Mojokerto’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from May to October, often witnesses a noticeable increase in particulate matter. This is largely attributable to reduced rainfall, which limits the natural cleansing effect of precipitation, and increased agricultural burning as farmers prepare fields for the next planting cycle. Temperature inversions are more frequent during this period, trapping pollutants closer to the ground, particularly in the evenings and early mornings. The dry winds, while sometimes offering some dispersion, can also carry pollutants from Surabaya and surrounding industrial areas. Conversely, the wet season (November to April) brings increased rainfall, which helps to wash away pollutants and generally improves air quality. However, periods of heavy fog, common during the wet season, can temporarily reduce visibility and trap moisture-laden pollutants near the surface. The monsoon winds, shifting direction seasonally, play a crucial role in pollutant transport. Months like July and August often experience elevated particulate levels due to a combination of agricultural burning and stagnant air. Outdoor activities are generally more favorable during the wet season, particularly during periods of consistent rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and monitoring local air quality reports. The interplay of these meteorological factors creates a dynamic air quality profile throughout the year.