30 Sep – 6 Oct 2026 · Malaysia
Johor weekly air quality
US AQI · PM2.5 · 24-hour source averages
Official DOE API mean: 113.2. 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
1335 eligible observations · 1 excluded.
+21.4 AQI compared with the previous week’s eligible mean of 106.
Peak AQI: 236 at Batu Pahat · 6 Oct 2026, 22:00 (UTC+8).
Daily US AQI (PM2.5)
Based on 184 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 | 148.8Unhealthy for Sensitive Groups | 179 | 192 / 0 |
| 2026-10-01 | 93.5Moderate | 152 | 192 / 0 |
| 2026-10-02 | 85.7Moderate | 122 | 191 / 1 |
| 2026-10-03 | 112.5Unhealthy for Sensitive Groups | 158 | 192 / 0 |
| 2026-10-04 | 138.6Unhealthy for Sensitive Groups | 158 | 192 / 0 |
| 2026-10-05 | 140.7Unhealthy for Sensitive Groups | 173 | 192 / 0 |
| 2026-10-06 | 173.4Unhealthy | 236 | 184 / 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 | 165 | 163.5 | 162.6 | 161.4 | 160.5 | 159.3 | 158.3 | 157.1 | 156.1 | 154.3 | 152.4 | 151.1 | 149.6 | 148.6 | 147.1 | 145.8 | 144.6 | 142.5 | 140 | 137 | 133.5 | 130.1 | 126.8 | 124 |
| 2026-10-01 | 120.8 | 117.1 | 114.1 | 110.4 | 108 | 104.9 | 102.6 | 100.6 | 97.9 | 94.9 | 92.6 | 89.3 | 87.3 | 85.3 | 83.4 | 81.5 | 80.9 | 80.9 | 81.4 | 81.6 | 81.8 | 82.4 | 82.3 | 82.4 |
| 2026-10-02 | 82.9 | 82.8 | 83 | 83.6 | 83.4 | 83.5 | 84 | 84.3 | 84.3 | 83.5 | 83 | 82.5 | 82.1 | 82.1 | 82.6 | 83.9 | 84.8 | 86.6 | 87.6 | 90.6 | 92 | 93 | 95 | 96.4 |
| 2026-10-03 | 97.9 | 99.1 | 99.9 | 100.6 | 101.8 | 102.5 | 103.5 | 104 | 104.5 | 106.3 | 108 | 110.6 | 112.4 | 114.8 | 117 | 118.3 | 119.6 | 120.8 | 121.6 | 123.6 | 125.9 | 127.5 | 129.5 | 131.5 |
| 2026-10-04 | 133.5 | 135.9 | 137.4 | 138.5 | 140.1 | 141.5 | 142.5 | 143.5 | 143.8 | 143.6 | 142.5 | 141.3 | 139.9 | 138.8 | 138.5 | 137.9 | 137.6 | 137.6 | 137 | 136 | 135.3 | 134.6 | 134.3 | 133.9 |
| 2026-10-05 | 133.6 | 133 | 133.1 | 132.8 | 132 | 131.8 | 131.6 | 131.4 | 131.8 | 132.4 | 131.6 | 132.8 | 134.3 | 136.6 | 139.3 | 142.6 | 145.5 | 148.6 | 150.8 | 153.6 | 156.4 | 158.6 | 160.6 | 162.4 |
| 2026-10-06 | 163.6 | 164.8 | 166 | 166.9 | 168 | 168.8 | 169.6 | 170.1 | 171.3 | 172.1 | 173.5 | 174.5 | 175.3 | 175.9 | 176.9 | 176.9 | 177.5 | 178.3 | 178.8 | 179.1 | 179.6 | 180.3 | 180.5 | — |
Observation categories
Good: 0
Moderate: 396
Unhealthy for Sensitive Groups: 450
Unhealthy: 474
Very Unhealthy: 15
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 |
|---|---|---|---|---|
| Pasir Gudang | 142.3Unhealthy for Sensitive Groups | 179 | 130 | 167 / 0 |
| Larkin | 140.5Unhealthy for Sensitive Groups | 175 | 129.1 | 167 / 0 |
| Batu Pahat | 135Unhealthy for Sensitive Groups | 236 | 122.4 | 166 / 1 |
| Segamat | 124.5Unhealthy for Sensitive Groups | 182 | 109.9 | 167 / 0 |
| Kluang | 121.2Unhealthy for Sensitive Groups | 177 | 106.2 | 167 / 0 |
| Tangkak | 120.6Unhealthy for Sensitive Groups | 182 | 104.7 | 167 / 0 |
| Kota Tinggi | 118.2Unhealthy for Sensitive Groups | 166 | 102.7 | 167 / 0 |
| Pengerang | 116.5Unhealthy for Sensitive Groups | 166 | 100.5 | 167 / 0 |