Air quality in Johor Bahru today
The air in Johor Bahru (Malaysia) now and over the next 48 hours: the US AQI and the European AQI, fine particles (PM2.5, PM10), ozone and nitrogen dioxide, compared with the WHO 2021 guidelines, with what it means for outdoor sport, children, older people and open windows.
These numbers are more than 7 hours old, so they are hidden. Open the live map for the current air. Open the air map centred on Johor Bahru
AQI right now
Unhealthy for sensitive groups. Main pollutant: Ozone (O₃), 1.3× the WHO guideline.
What to do today
- Outdoor sport Shorten long or intense efforts; train when the AQI is lowest.
- Children, older people, asthma Limit long or intense activity outdoors; keep reliever inhalers at hand.
- Windows Air briefly at the cleanest hour, otherwise keep closed.
AQI in Johor Bahru hour by hour, next 48 hours
- Good
- Moderate
- Unhealthy for sensitive groups
- Unhealthy
- Very unhealthy
- Hazardous
Cleanest hour in the next 24 h: Mon 06:00 (AQI 67). Worst hour: Sun 08:00 (AQI 138).
US AQI per hour, local time. Bars coloured by category.
Compared with the WHO 2021 guidelines
| Pollutant | Next 24 h | WHO guideline | Ratio |
|---|---|---|---|
| PM2.5 | 18 µg/m³ | 15 µg/m³ | 1.2× |
| PM10 | 18 µg/m³ | 45 µg/m³ | within |
| Nitrogen dioxide (NO₂) | 24 µg/m³ | 25 µg/m³ | within |
| Ozone (O₃) | 133 µg/m³ | 100 µg/m³ | 1.3× |
PM2.5, PM10 and NO₂: 24-hour mean of the forecast against the 24-hour guideline; ozone: highest 8-hour mean against the 8-hour guideline.
Forecast for Sun 08:00 local time · updated 2026-10-25 00:41 UTC
Air quality map around Johor Bahru
Live PM2.5 field (NOAA GEFS-Aerosols): a different model, so it can disagree with the numbers above by a few units.
More about Johor Bahru
Bad air alert for Johor Bahru
Air quality alerts are part of LayEarth Pro: one push the evening before the forecast US AQI in your city goes above your level, so you can move a run, a school trip or an open window in time. 7-day free trial, then 9 USD a month.
Questions
- What is the AQI in Johor Bahru right now?
- US AQI 138 (Unhealthy for sensitive groups), European AQI 43; PM2.5 20 µg/m³ (Sun 08:00).
- Is it safe to exercise outdoors in Johor Bahru today?
- Shorten long or intense efforts; train when the AQI is lowest.
- What is the main pollutant in Johor Bahru?
- Ozone (O₃), 1.3× the WHO guideline.
- Where do the numbers come from?
- The CAMS global air-quality forecast of the Copernicus Atmosphere Monitoring Service, read through Open-Meteo: a model on a ~40 km grid, not a monitoring station. Where a nearby monitor disagrees, the monitor is right.
Nearby cities
Singapore · Kuala Lumpur · George Town (Penang) · Medan · Langkawi · Kuching
How it is computed
Hourly CAMS forecast (Copernicus) for the coordinates of Johor Bahru via Open-Meteo; US AQI per the US EPA breakpoints, European AQI per the EEA bands, WHO 2021 air-quality guidelines. The page is rebuilt every 3 hours. Live map.