30 Sep – 6 Oct 2026 · Malaysia
Selangor weekly air quality
US AQI · PM2.5 · 24-hour source averages
Official DOE API mean: 99.6. Calculated separately from reported official observations.
Each DOE observation identified as PM2.5 is converted using the published API formula and US AQI breakpoints. This is not an official all-pollutant AQI or NowCast. Calculation details
972 eligible observations · 0 excluded.
+24.2 AQI compared with the previous week’s eligible mean of 92.4.
Peak AQI: 189 at JOHAN SETIA · 30 Sept 2026, 00:00 (UTC+8).
Daily US AQI (PM2.5)
Based on 108 hourly readings.
Daily and hourly means use eligible observations across the selected locations. Each observation uses a 24-hour PM2.5 average.
Export AQI CSVMeans and peaks use only converted observations. Missing days remain gaps.
| Day | Mean AQI | Peak AQI | Eligible / excluded |
|---|---|---|---|
| 2026-09-30 | 161Unhealthy | 189 | 144 / 0 |
| 2026-10-01 | 135Unhealthy for Sensitive Groups | 163 | 144 / 0 |
| 2026-10-02 | 98Moderate | 143 | 144 / 0 |
| 2026-10-03 | 84Moderate | 111 | 144 / 0 |
| 2026-10-04 | 106.7Unhealthy for Sensitive Groups | 152 | 144 / 0 |
| 2026-10-05 | 111.7Unhealthy for Sensitive Groups | 155 | 144 / 0 |
| 2026-10-06 | 120.8Unhealthy for Sensitive Groups | 167 | 108 / 0 |
Hourly means (UTC+8)
| Day | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-09-30 | 172 | 171.3 | 170.8 | 170 | 169.5 | 168.8 | 168.2 | 168.7 | 168.3 | 168.2 | 167.8 | 166.5 | 164.2 | 160.7 | 158.7 | 157.5 | 154.7 | 154.5 | 152.8 | 150.2 | 147.8 | 145.5 | 144 | 144 |
| 2026-10-01 | 143.2 | 143 | 143.5 | 143.3 | 143.3 | 141.7 | 141 | 139.8 | 138.5 | 137.3 | 137 | 136.3 | 136.8 | 136.7 | 135.2 | 133.8 | 132.7 | 130.2 | 127.3 | 125.7 | 124.8 | 123.7 | 123.7 | 122.7 |
| 2026-10-02 | 122.2 | 120.5 | 118.5 | 116.3 | 114.3 | 113 | 111.2 | 109 | 107.5 | 103.8 | 101.2 | 98.3 | 94.2 | 91.3 | 88.8 | 85.5 | 83.5 | 81.3 | 81.5 | 83 | 82.3 | 82.3 | 81.5 | 80.8 |
| 2026-10-03 | 79.5 | 78.8 | 77.8 | 78 | 77.3 | 78.2 | 78.2 | 78.8 | 80 | 80.8 | 81.8 | 81.5 | 82.5 | 84 | 85 | 86.2 | 87.7 | 89.3 | 91 | 91.2 | 90.8 | 91.7 | 92.3 | 93.8 |
| 2026-10-04 | 94 | 95 | 96.8 | 98.2 | 99.2 | 101.2 | 102 | 102.3 | 103.5 | 103.8 | 105.2 | 106.5 | 107.7 | 108.7 | 109.3 | 110.2 | 111.2 | 112.3 | 112.7 | 113 | 115.2 | 116.5 | 118.5 | 118.3 |
| 2026-10-05 | 119 | 118.8 | 118.2 | 117 | 115.8 | 114.7 | 114.2 | 114.5 | 114.2 | 114.2 | 113.8 | 113.5 | 113 | 112.3 | 111.5 | 110.7 | 109.3 | 107.7 | 107 | 106.2 | 104.7 | 104.2 | 102.8 | 102.8 |
| 2026-10-06 | 102.2 | 103 | 104.5 | 106.7 | 108.5 | 110 | 111.5 | 112.5 | 113.2 | 115.5 | 118.8 | 124.3 | 130.2 | 135.7 | 140.3 | 142.7 | 146 | 149.5 | — | — | — | — | — | — |
Observation categories
Good: 0
Moderate: 357
Unhealthy for Sensitive Groups: 397
Unhealthy: 218
Very Unhealthy: 0
Hazardous: 0
| AQI | Category |
|---|---|
| 0–50 | Good |
| 51–100 | Moderate |
| 101–150 | Unhealthy for Sensitive Groups |
| 151–200 | Unhealthy |
| 201–300 | Very Unhealthy |
| 301+ | Hazardous |
Stations by US AQI
Sorted by eligible mean AQI. Counts show the available coverage.
| Location | Mean AQI | Peak AQI | Official DOE API mean | Eligible / excluded |
|---|---|---|---|---|
| JOHAN SETIA | 135.1Unhealthy for Sensitive Groups | 189 | 119.9 | 162 / 0 |
| Shah Alam | 128.8Unhealthy for Sensitive Groups | 178 | 108.4 | 162 / 0 |
| Klang | 116.9Unhealthy for Sensitive Groups | 173 | 101.4 | 162 / 0 |
| Petaling Jaya | 114.4Unhealthy for Sensitive Groups | 165 | 97.4 | 162 / 0 |
| Banting | 114.3Unhealthy for Sensitive Groups | 167 | 93.8 | 162 / 0 |
| Kuala Selangor | 90.2Moderate | 162 | 76.8 | 162 / 0 |