AirAware › Singapore PSI
Singapore PSI and haze today
As of 7:00 pm SGT, 18 October 2026, NEA’s 24-hr PSI ranges from 106 to 186 across Singapore’s five regions, highest in West (Unhealthy). The highest 1-hr PM2.5 is 74 µg/m³.
- North106
- South133
- East139
- West186
- Central143
| Region | 24-hr PSI | 1-hr PM2.5 µg/m³ |
|---|---|---|
| NorthWoodlands, Yishun, Sembawang, Punggol, Sengkang, Admiralty | 106Unhealthy | 37Band I · Normal |
| SouthBukit Merah, Queenstown, Orchard, City, Bukit Timah, Holland | 133Unhealthy | 69Band II · Elevated |
| EastTampines, Bedok, Hougang, Pasir Ris, Serangoon, Kallang | 139Unhealthy | 59Band II · Elevated |
| WestJurong West, Jurong East, Choa Chu Kang, Bukit Batok, Bukit Panjang, Clementi | 186Unhealthy | 68Band II · Elevated |
| CentralAng Mo Kio, Bishan, Toa Payoh, Thomson, Sin Ming, Marymount | 143Unhealthy | 74Band II · Elevated |
Towns follow NEA’s guide to the areas each region covers. NEA publishes no boundary map; if your location isn’t listed, NEA advises using the region closest to you. NEA FAQ. For the official picture and MOH’s advice, compare the 24-hr PSI. For what the air is like right now, compare the 1-hr PM2.5.
MOH advice at the highest regional 24-hr PSI (186, Unhealthy)
PSI Forecast: 150 - 220 (Unhealthy to Very Unhealthy)
Quoted from NEA’s Haze Situation Update, issued 2026-10-17 · source.
PSI over the past 7 days
Each day’s highest hourly 24-hr PSI per region, from NEA readings AirAware has stored. Days with fewer than 18 hourly readings are left out.
| Day (SGT) | Highest of five regions · North, South, East, West, Central |
|---|---|
| Sun, 18 Oct | 230 Very UnhealthyN 130 · S 174 · E 182 · W 230 · C 187 |
| Sat, 17 Oct | 212 Very UnhealthyN 151 · S 174 · E 186 · W 212 · C 208 |
| Fri, 16 Oct | 229 Very UnhealthyN 162 · S 186 · E 205 · W 205 · C 229 |
| Thu, 15 Oct | 212 Very UnhealthyN 130 · S 165 · E 174 · W 212 · C 198 |
| Wed, 14 Oct | 205 Very UnhealthyN 127 · S 161 · E 174 · W 205 · C 185 |
| Tue, 13 Oct | 174 UnhealthyN 129 · S 134 · E 156 · W 174 · C 170 |
| Mon, 12 Oct | 166 UnhealthyN 125 · S 123 · E 144 · W 166 · C 159 |
Bar scale 0–300 · ticks at 100 and 200
How many days were unhealthy
Of the last 30 complete days (Sat, 19 Sept to Sun, 18 Oct), counted by each day’s highest regional 24-hr PSI:
| Category | Days |
|---|---|
| Good | 0 |
| Moderate | 7 |
| Unhealthy | 18 |
| Very Unhealthy | 5 |
| Hazardous | 0 |
What the PSI is
The Pollutant Standards Index (PSI) is Singapore’s official air-quality index, published by the National Environment Agency (NEA) for five regions: North, South, East, West and Central. It covers six pollutants: PM2.5, PM10, sulphur dioxide, nitrogen dioxide, ozone and carbon monoxide (PM2.5 was added in April 2014). NEA works out a sub-index for each pollutant and reports the highest as the PSI. MOH’s health advisory is based on the 24-hr PSI, and NEA does not use a 1-hr PSI. Source: NEA.
| 24-hr PSI | Category |
|---|---|
| 0–50 | Good |
| 51–100 | Moderate |
| 101–200 | Unhealthy |
| 201–300 | Very Unhealthy |
| Above 300 | Hazardous |
How the 24-hr PSI is calculated
NEA computes the 24-hr PSI over a rolling 24-hour period, so it is recalculated every hour and changes gradually. Each pollutant is measured over its own averaging period: 24 hours for PM2.5, PM10 and sulphur dioxide, 8 hours for ozone and carbon monoxide, and 1 hour for nitrogen dioxide. The highest of the six sub-indices becomes the PSI. NEA FAQ · NEA pollutant concentrations.
What to do at each level
| 24-hr PSI | Healthy persons | Elderly, pregnant women, children | Chronic lung or heart disease |
|---|---|---|---|
| 0–100 Good · Moderate | Normal activities | Normal activities | Normal activities |
| 101–200 Unhealthy | Reduce prolonged or strenuous outdoor physical exertion | Minimise prolonged or strenuous outdoor physical exertion | Avoid prolonged or strenuous outdoor physical exertion |
| 201–300 Very unhealthy | Avoid prolonged or strenuous outdoor physical exertion | Minimise outdoor activity | Avoid outdoor activity |
| 301+ Hazardous | Minimise outdoor activity | Avoid outdoor activity | Avoid outdoor activity |
What haze is
In Singapore, haze usually means smoke from fires that has drifted into the air here. It shows up mainly as higher PM2.5, which pushes up the PSI. NEA notes that a burning smell can sometimes come from local burning rather than regional fires. AirAware reports NEA’s readings and does not attribute any reading to a particular source. NEA FAQ.
Transboundary haze
NEA says the transboundary haze affecting Singapore mainly comes from forest and peat fires elsewhere in the region. It is most likely during the Southwest Monsoon, which the Meteorological Service Singapore gives as June to September, when prevailing winds blow from the southeast to the south. The ASEAN Specialised Meteorological Centre, hosted by MSS, monitors land and forest fires and hotspots across the region. Singapore’s Transboundary Haze Pollution Act 2014 addresses conduct that causes or contributes to haze pollution in Singapore. NEA · MSS · ASMC · Singapore Statutes Online.
Where to get official updates
Sources: NEA air pollution FAQs · haze.gov.sg (NEA) · HealthHub: protect yourself against haze · ASEAN Specialised Meteorological Centre · Transboundary Haze Pollution Act 2014