Air quality
Air quality in Petaling Jaya today
Updated
Moderate (US AQI 73) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 2:00 am (18:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Petaling Jaya, Selangor, Malaysia, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 73 Moderate
- PM2.5
- 12 µg/m³ 0.8× WHO 24-h guideline
- PM10
- 12 µg/m³
- Ozone
- 0 µg/m³
- Dominant pollutant
- PM2.5 sub-index 73
- Best hour today
- 9:00 am AQI 59
- European AQI
- 52
Air quality in Petaling Jaya right now
Right now the modelled US Air Quality Index for Petaling Jaya, Selangor, Malaysia is 73, which falls in the "Moderate" band (up to 100). Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
The index is driven mainly by PM2.5, whose own sub-index is 73. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.
PM2.5 is 12 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 12 µg/m³ against a guideline of 45; ozone is 0 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 45 µg/m³ (above the 24-hour guideline of 25).
Also this hour: carbon monoxide 659 µg/m³.
Petaling Jaya AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 59 around Mon 9:00 am to 109 around Tue 2:00 am, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day is expected to be worse, averaging about 124 against 68 for the next 24 hours.
| Local time (Asia/Kuala_Lumpur) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 2:00 am | 73 | Moderate | 12.1 | 12 | 0 |
| Mon 5:00 am | 62 | Moderate | 2.7 | 3 | 19 |
| Mon 8:00 am | 60 | Moderate | 11.6 | 12 | 7 |
| Mon 11:00 am | 60 | Moderate | 27 | 27 | 33 |
| Mon 2:00 pm | 62 | Moderate | 14.5 | 15 | 102 |
| Mon 5:00 pm | 63 | Moderate | 17.5 | 18 | 88 |
| Mon 8:00 pm | 67 | Moderate | 110.6 | 111 | 0 |
| Mon 11:00 pm | 89 | Moderate | 115.3 | 116 | 0 |
| Tue 2:00 am | 109 | Unhealthy for Sensitive Groups | 48.3 | 49 | 0 |
| Tue 5:00 am | 118 | Unhealthy for Sensitive Groups | 29.9 | 30 | 0 |
| Tue 8:00 am | 126 | Unhealthy for Sensitive Groups | 32.4 | 33 | 7 |
| Tue 11:00 am | 127 | Unhealthy for Sensitive Groups | 25.1 | 25 | 118 |
| Tue 2:00 pm | 129 | Unhealthy for Sensitive Groups | 24.3 | 24 | 204 |
| Tue 5:00 pm | 132 | Unhealthy for Sensitive Groups | 22.7 | 23 | 156 |
| Tue 8:00 pm | 130 | Unhealthy for Sensitive Groups | 64 | 64 | 2 |
| Tue 11:00 pm | 116 | Unhealthy for Sensitive Groups | 69.6 | 70 | 1 |
| Wed 2:00 am | 110 | Unhealthy for Sensitive Groups | 66.1 | 66 | 0 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in Petaling Jaya today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 9:00 am (AQI 59, Moderate) and the worst around 9:00 pm (AQI 74). That is a swing of 15 points, so a run or walk around 9:00 am is noticeably better.
Petaling Jaya vs the rest of Malaysia
Across 55 Malaysia cities we track, the average US AQI right now is 63 (Moderate). Petaling Jaya at 73 is 10 points worse than average.
It ranks 27 of 55 from cleanest to most polluted; the cleanest is Ipoh (17) and the most polluted Kuching (154).
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Petaling Jaya
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Bandar Utama | 5 km | 73 | Moderate | 12.1 |
| Kota Damansara | 6 km | 73 | Moderate | 12.1 |
| Shah Alam | 9 km | 73 | Moderate | 12.1 |
| Kampung Baru Subang | 9 km | 73 | Moderate | 12.1 |
| Kuala Lumpur | 10 km | 73 | Moderate | 12.1 |
| Taman Petaling | 11 km | 73 | Moderate | 12.1 |
| Puchong | 12 km | 73 | Moderate | 12.1 |
| Sentul | 12 km | 73 | Moderate | 12.1 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Petaling Jaya, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Advice for sensitive groups
At 73, most people are fine outdoors. If you are unusually sensitive to PM2.5, keep long or intense workouts to the cleaner hours shown above.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for Petaling Jaya
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).