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The Dinas Lingkungan Hidup (DLH) of Jakarta recorded a decline in air‑pollutant concentrations on the morning of Saturday, 24 October, according to data from the city’s Air Quality Monitoring Station (SPKU). The most pronounced drop occurred between 04:00 and 07:00 WIB, with levels of fine particulate matter (PM₂.₅), coarse particulate matter (PM₁₀), and sulfur dioxide (SO₂) trending lower across all five administrative regions of the city. “SPKU monitoring shows a tendency for pollutant concentrations to fall in the five Jakarta regions on Saturday morning,” said Dudi Gardesi, head of DLH Jakarta. In South Jakarta, PM₂.₅ concentrations fell to a range of 12–32 µg/m³ between 04:00 and 05:00 WIB, well below the national standard of 55 µg/m³. The coastal area of North Jakarta recorded PM₂.₅ levels between 9 and 17 µg/m³ during the same period. Similar downward trends were observed in West, East, and Central Jakarta. In Central Jakarta, PM₂.₅ and PM₁₀ concentrations were recorded between 12 and 43 µg/m³ in the morning hours. DLH attributed the improvement to a combination of meteorological conditions, reduced local emission activity, and the possible influence of an operational weather modification program (OMC). “Rain triggered by weather modification can help remove particulate matter from the atmosphere through wet deposition,” Gardesi said. He added that further analysis is needed to quantify the contribution of each factor and to assess the sustainability of the air‑quality gains. Marulitua Sijabat, head of the Jakarta Disaster Management Agency (BPBD), explained that the OMC was carried out to maximize rainfall potential and create more comfortable conditions for residents. “We continue to monitor weather developments with BMKG to ensure that OMC is implemented accurately,” he said. According to BPBD reports, the OMC involved four sorties from 21 to 23 October using the PK‑SNH aircraft, which dispersed sodium chloride (NaCl) over Bogor, Depok, Bekasi, and South Jakarta. The program produced varying rainfall intensities across the Greater Jakarta area, with light to moderate showers recorded on Friday, 23 October, in South Jakarta, East Jakarta, Depok, Bogor, and South Tangerang. In addition to the OMC, the Jakarta provincial government sprayed water mist along several roads that serve as routes for the Jakarta Marathon 2026. The operation, carried out by the Central and South Jakarta environmental departments together with the Fire and Rescue Department, aimed to cool the environment and improve runners’ comfort. According to the IQAir website, Jakarta’s overall air quality on Sunday morning was classified as “moderate,” with a score of 79 and a PM₂.₅ concentration of 24 µg/m³. This level is 4.8 times higher than the World Health Organization’s annual guideline for PM₂.₅. WHO recommends that sensitive groups reduce outdoor activities, wear masks, close windows to prevent polluted air from entering homes, and use air purifiers when possible. Article source: Koran Jakarta | Image credit: Koran Jakarta
The Dinas Lingkungan Hidup (DLH) of Jakarta recorded a decline in air‑pollutant concentrations on the morning of Saturday, 24 October, according to data from the city’s Air Quality Monitoring Station (SPKU). The most pronounced drop occurred between 04:00 and 07:00 WIB, with levels of fine particulate matter (PM₂.₅), coarse particulate matter (PM₁₀), and sulfur dioxide (SO₂) trending lower across all five administrative regions of the city. “SPKU monitoring shows a tendency for pollutant concentrations to fall in the five Jakarta regions on Saturday morning,” said Dudi Gardesi, head of DLH Jakarta. In South Jakarta, PM₂.₅ concentrations fell to a range of 12–32 µg/m³ between 04:00 and 05:00 WIB, well below the national standard of 55 µg/m³. The coastal area of North Jakarta recorded PM₂.₅ levels between 9 and 17 µg/m³ during the same period. Similar downward trends were observed in West, East, and Central Jakarta. In Central Jakarta, PM₂.₅ and PM₁₀ concentrations were recorded between 12 and 43 µg/m³ in the morning hours. DLH attributed the improvement to a combination of meteorological conditions, reduced local emission activity, and the possible influence of an operational weather modification program (OMC). “Rain triggered by weather modification can help remove particulate matter from the atmosphere through wet deposition,” Gardesi said. He added that further analysis is needed to quantify the contribution of each factor and to assess the sustainability of the air‑quality gains. Marulitua Sijabat, head of the Jakarta Disaster Management Agency (BPBD), explained that the OMC was carried out to maximize rainfall potential and create more comfortable conditions for residents. “We continue to monitor weather developments with BMKG to ensure that OMC is implemented accurately,” he said. According to BPBD reports, the OMC involved four sorties from 21 to 23 October using the PK‑SNH aircraft, which dispersed sodium chloride (NaCl) over Bogor, Depok, Bekasi, and South Jakarta. The program produced varying rainfall intensities across the Greater Jakarta area, with light to moderate showers recorded on Friday, 23 October, in South Jakarta, East Jakarta, Depok, Bogor, and South Tangerang. In addition to the OMC, the Jakarta provincial government sprayed water mist along several roads that serve as routes for the Jakarta Marathon 2026. The operation, carried out by the Central and South Jakarta environmental departments together with the Fire and Rescue Department, aimed to cool the environment and improve runners’ comfort. According to the IQAir website, Jakarta’s overall air quality on Sunday morning was classified as “moderate,” with a score of 79 and a PM₂.₅ concentration of 24 µg/m³. This level is 4.8 times higher than the World Health Organization’s annual guideline for PM₂.₅. WHO recommends that sensitive groups reduce outdoor activities, wear masks, close windows to prevent polluted air from entering homes, and use air purifiers when possible.
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