Singapore PM2.5 live 1-hour PM2.5 and PSI now
PM2.5 is elevated this hour. Consider a shorter or easier session outdoors, especially if you are sensitive to haze.
Live Highest 1-hr PM2.5 in West. NEA reading for 15 Oct, 12am. Last refreshed 15 Oct, 12:02am
PM2.5 trend, last 24 hours
Hourly NEA readings in µg/m³. Pick a region to see its own line. Shaded bands mark NEA's PM2.5 bands.
1-hour PM2.5, last 24 hours
24-hour PSI, last 24 hours
PM2.5 and PSI by region now
The 1-hour PM2.5 reading was 63–113 µg/m³ at 15 Oct, 12am SGT, highest in the West (Band II Elevated). PSI live page
| Region | 24-hr PSI | 1-hr PM2.5 µg/m³ | 24-hr PM2.5 µg/m³ | 24-hr PM10 µg/m³ | 8-hr O₃ µg/m³ |
|---|---|---|---|---|---|
| West | 206 Very unhealthy | 113 Band II Elevated | 156 | 175 | 37 |
| Central | 186 Unhealthy | 98 Band II Elevated | 137 | 166 | 70 |
| East | 174 Unhealthy | 98 Band II Elevated | 125 | 170 | 60 |
| South | 160 Unhealthy | 88 Band II Elevated | 112 | 147 | 40 |
| North | 127 Unhealthy | 63 Band II Elevated | 81 | 99 | 104 |
What the PM2.5 bands mean
| Band | 1-hr PM2.5 (µg/m³) | What to do in the next hour or so |
|---|---|---|
| I Normal | 0–55 | Normal activities |
| II Elevated | 56–150 | Consider cutting back strenuous outdoor activity, especially sensitive groups |
| III High | 151–250 | Move strenuous activity indoors. Sensitive groups stay inside |
| IV Very high | 251 and above | Everyone stays indoors where possible |
PM2.5 questions
What is the PM2.5 level in Singapore now?
The 1-hour PM2.5 reading was 63–113 µg/m³ at 15 Oct, 12am SGT, highest in the West (Band II Elevated). This page updates live from NEA every 30 minutes.
What is PM2.5?
PM2.5 is fine particulate matter 2.5 micrometres across or smaller, about thirty times thinner than a human hair. It gets deep into the lungs and bloodstream. Smoke from peat and forest fires is mostly PM2.5, so it is the pollutant that rises fastest during haze.
What is a safe PM2.5 level in Singapore?
NEA's 1-hour PM2.5 bands are: Band I Normal 0–55 µg/m³, Band II Elevated 56–150, Band III High 151–250 and Band IV Very high above 250. Band I is fine for normal activity. In Band II and above, reduce strenuous outdoor activity, especially if you are sensitive to haze.
What is the difference between 1-hour PM2.5 and 24-hour PSI?
The 1-hour PM2.5 shows how much fine particulate is in the air this hour, so it reacts quickly when smoke drifts in or clears. The 24-hour PSI averages over a day and covers six pollutants. NEA's health advice is based on the 24-hour PSI, while the 1-hour PM2.5 is for deciding on activities in the next few hours.
How is 24-hour PM2.5 turned into PSI?
NEA converts the 24-hour average PM2.5 into a sub-index: 12 µg/m³ is a PSI of 50, 55 µg/m³ is 100, 150 µg/m³ is 200, 250 µg/m³ is 300 and 350 µg/m³ is 400. The PSI is the highest of the six pollutant sub-indices, which during haze is almost always PM2.5.
Do air purifiers help with PM2.5?
Yes. A purifier with a true HEPA filter, sized for the room and run with windows and doors closed, removes most PM2.5 indoors. Fans and air conditioners that only recirculate air do not filter particles unless they have a suitable filter.