Singapore PSI & haze today
NEA reading of 13 Nov, 6:00 pm · updates hourly
Air quality is moderate across Singapore right now. The highest 24-hour PSI is 70, in West, as of 13 Nov, 6:00 pm.
The 1-hour PM2.5 is in the normal band in every region.
NorthWoodlands checkpoint
PSI60
PM2.512
WestTuas checkpoint
PSI70
PM2.540
Central
PSI60
PM2.512
East
PSI53
PM2.514
South
PSI59
PM2.515
Since 3 pm, the 1-hour PM2.5 in West has risen from 17 to 40 µg/m³. Today's range there: 17–40. Clearest air right now (1-hour PM2.5): North, 12 µg/m³.
Today so far
Every hourly reading NEA has published today, 12 am to 6 pm. Dashed lines mark NEA's band edges. Tap or hover a chart for any hour.
Show as table
| Hour | North | West | Central | East | South |
|---|---|---|---|---|---|
| 12 am | 28 | 28 | 20 | 18 | 17 |
| 1 am | 24 | 31 | 24 | 17 | 20 |
| 2 am | 21 | 35 | 21 | 19 | 19 |
| 3 am | 19 | 31 | 22 | 16 | 21 |
| 4 am | 15 | 24 | 22 | 16 | 15 |
| 5 am | 21 | 31 | 23 | 11 | 21 |
| 6 am | 21 | 24 | 16 | 15 | 20 |
| 7 am | 23 | 26 | 25 | 12 | 17 |
| 8 am | 25 | 28 | 24 | 13 | 17 |
| 9 am | 26 | 22 | 21 | 11 | 16 |
| 10 am | 27 | 31 | 23 | 8 | 20 |
| 11 am | 23 | 31 | 18 | 12 | 22 |
| 12 pm | 21 | 26 | 15 | 14 | 20 |
| 1 pm | 18 | 23 | 12 | 11 | 11 |
| 2 pm | 12 | 20 | 12 | 10 | 15 |
| 3 pm | 7 | 17 | 10 | 9 | 22 |
| 4 pm | 11 | 37 | 9 | 13 | 24 |
| 5 pm | 11 | 38 | 14 | 9 | 16 |
| 6 pm | 12 | 40 | 12 | 14 | 15 |
Show as table
| Hour | North | West | Central | East | South |
|---|---|---|---|---|---|
| 12 am | 62 | 62 | 64 | 58 | 60 |
| 1 am | 62 | 62 | 64 | 57 | 60 |
| 2 am | 62 | 63 | 65 | 57 | 59 |
| 3 am | 63 | 63 | 65 | 57 | 59 |
| 4 am | 62 | 64 | 65 | 57 | 59 |
| 5 am | 63 | 65 | 65 | 56 | 60 |
| 6 am | 63 | 65 | 65 | 56 | 60 |
| 7 am | 64 | 65 | 65 | 56 | 60 |
| 8 am | 64 | 66 | 65 | 56 | 60 |
| 9 am | 64 | 67 | 65 | 56 | 60 |
| 10 am | 64 | 67 | 65 | 56 | 60 |
| 11 am | 64 | 68 | 65 | 55 | 60 |
| 12 pm | 64 | 69 | 65 | 55 | 60 |
| 1 pm | 64 | 69 | 64 | 55 | 59 |
| 2 pm | 63 | 69 | 63 | 55 | 59 |
| 3 pm | 62 | 69 | 63 | 54 | 60 |
| 4 pm | 61 | 69 | 62 | 54 | 60 |
| 5 pm | 60 | 70 | 61 | 53 | 60 |
| 6 pm | 60 | 70 | 60 | 53 | 59 |
What NEA advises now
For the next hour
From the 1-hour PM2.5, highest at 40 µg/m³ in West: the normal band (0–55 µg/m³).
- Everyone
- Continue with normal activities
- Elderly, pregnant women, children, people with heart or lung disease
- Continue with normal activities
For the day ahead
From the 24-hour PSI, highest at 70 in West: moderate.
- Healthy persons
- Normal activities
- Elderly, pregnant women, children
- Normal activities
- Chronic lung or heart disease
- Normal activities
The readings show only the air now. For the risk of haze over the coming days, NEA publishes a daily outlook with satellite hotspot counts and wind direction for Sumatra, Kalimantan and Peninsular Malaysia at haze.gov.sg.
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About these readings
Singapore measures air quality with the Pollutant Standards Index (PSI), published hourly by the National Environment Agency for five regions — north, south, east, west and central. The figure most people mean by "the PSI" is the 24-hour PSI, which averages the past day and is what NEA's health advisory is written against.
During a haze episode the 24-hour PSI lags what you can actually smell outside, because it is still carrying yesterday's cleaner air. The 1-hour PM2.5 reading is the one that moves first, and NEA publishes a separate personal guide against it for deciding whether to go out in the next hour. Both are shown below.
For travellers crossing to Johor, haze rarely closes a checkpoint, but it does change how long you want to be sitting in a queue with the windows down. The north reading covers Woodlands and the west covers Tuas.
NEA's full 24-hour PSI health advisory+
| PSI | Healthy persons | Elderly, pregnant women, children | Chronic lung or heart disease |
|---|---|---|---|
| Good0–50 | Normal activities | Normal activities | Normal activities |
| Moderate51–100Now | Normal activities | Normal activities | Normal activities |
| Unhealthy101–200 | Reduce prolonged or strenuous outdoor physical exertion | Minimise prolonged or strenuous outdoor physical exertion | Avoid prolonged or strenuous outdoor physical exertion |
| Very Unhealthy201–300 | Avoid prolonged or strenuous outdoor physical exertion | Minimise outdoor activity | Avoid outdoor activity |
| HazardousAbove 300 | Minimise outdoor activity | Avoid outdoor activity | Avoid outdoor activity |
Advisory wording is NEA's, from its PSI and PM2.5 guide. NEA notes the guide is not intended to be prescriptive: for the general population, symptoms from short-term exposure such as throat or eye irritation are expected to resolve after leaving the exposure. Readings come from NEA via data.gov.sg.
Common questions
What PSI level is considered unhealthy in Singapore?+
A 24-hour PSI above 100 is Unhealthy. NEA bands the index as 0–50 Good, 51–100 Moderate, 101–200 Unhealthy, 201–300 Very Unhealthy and above 300 Hazardous. The health advice changes at each band, and changes differently depending on whether you are a healthy adult or in a vulnerable group.
What is the difference between the PSI and PM2.5?+
The PSI is an index, not a measurement: NEA works out a sub-index for each of six pollutants (PM2.5, PM10, sulphur dioxide, nitrogen dioxide, ozone and carbon monoxide) from their 24-hour average levels, and the highest sub-index becomes the PSI. It has no units and moves slowly. The 1-hour PM2.5 is a direct measurement of fine particles — the main ingredient of haze — in micrograms per cubic metre, averaged over the last hour, so it reacts fast. NEA says to use the 1-hour PM2.5 for immediate decisions, such as whether to go for a walk or run now, and the 24-hour PSI for planning ahead. Because one covers a day and the other an hour, they can disagree: after haze clears, the PSI can stay Unhealthy while the PM2.5 is already Normal; when haze arrives, the PM2.5 jumps hours before the PSI follows.
Source: NEA air pollution FAQs
Is it safe to exercise outdoors when there is haze?+
NEA advises using the 1-hour PM2.5 reading, not the 24-hour PSI, for anything you are about to do in the next hour. Up to 55 µg/m³ you can continue normal activities. From 56 to 150 µg/m³ healthy people should reduce strenuous outdoor activity, and vulnerable persons should avoid it. Above 250 µg/m³ everyone should minimise or avoid outdoor activity entirely.
Who counts as a vulnerable person?+
NEA defines vulnerable persons as the elderly, pregnant women, children, and persons with chronic lung disease or heart disease. They get the stricter instruction at every level above the normal band.
Why is the PSI different in different parts of Singapore?+
Haze arrives on the wind, so the regions nearest the source read higher first. It is common for the west to be well above the east, or the reverse, depending on wind direction. This is why NEA publishes five regional readings rather than one national figure.
Does haze affect Woodlands and Tuas checkpoint crossings?+
Haze does not normally close a checkpoint or change immigration processing. What it changes is the experience of queuing: on a bad day a long wait is spent in the open air near the Causeway. Check the north reading for Woodlands and the west reading for Tuas, and the live camera feeds for how long the queue actually is.
How often are these readings updated?+
NEA publishes new readings hourly. This page reads them from data.gov.sg with a cache of at most ten minutes, so the figure shown is the most recent hourly reading NEA has released.
Both crossings at a glanceWoodlands CheckpointTuas Second LinkSingapore rain map