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Collection: Historical Pollutant Standards Index (PSI)

Dataset: Historical Pollutant Standards Index (PSI) (2021)

Environment

Historical Pollutant Standards Index (PSI) (2021)

Data from Jan 2021 to Dec 2021

Last updated: 16 Apr 2025, 18:26 SGT

NEA (National Environment Agency)

Historical Pollutant Standards Index (PSI) for Singapore. All timestamps are provided in Singapore Time (SGT), formatted in ISO 8601.

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Disclaimer: This dataset may contain missing records and has not undergone quality control procedures applied to climate data and records. For official climate records or climate data reports, please contact sales_climo@nea.gov.sg. Please note that fees may apply for data and report preparation.

Data explorer

HistoricalPollutantStandardsIndexPSI2021.csv (49.7K rows, 8.8 MB)

Date Date (YYYY-MM-DD)	Timestamp Text	Update Timestamp Text	Region Text	Region Id Text	Location Longitude Numeric	Location Latitude Numeric	Pm10 Twenty Four Hourly Numeric	Pm10 Sub Index Numeric	Pm25 Twenty Four Hourly Numeric	Pm25 Sub Index Numeric	O3 Eight Hour Max Numeric	O3 Sub Index Numeric	Co Eight Hour Max Numeric	Co Sub Index Numeric	So2 Sub Index Numeric	So2 Twenty Four Hourly Numeric	No2 One Hour Max Numeric	Psi Twenty Four Hourly Numeric	Psi Three Hourly Numeric
(Null)0.0%	(Null)0.0% 2021-01-01T00:00:00+08:00<0.1% 2021-01-01T01:00:00+08:00<0.1% 2021-01-01T02:00:00+08:00<0.1% 2021-01-01T03:00:00+08:00<0.1%	(Null)0.0% 2021-01-01T00:08:52+08:00<0.1% 2021-01-01T01:08:52+08:00<0.1% 2021-01-01T02:08:53+08:00<0.1% 2021-01-01T03:08:52+08:00<0.1%	(Null)0.0% east16.7% west16.7% north16.7% south16.7%	(Null)0.0% NRS16.7% rCE16.7% rEA16.7% rNO16.7%	(Null)0.0% 016.7% 103.8200050.0% 103.7000016.7% 103.9400016.7%	(Null)0.0% 016.7% 1.3573550.0% 1.2958716.7% 1.4180316.7%	(Null)0.0% 28.05.1% 29.05.1% 27.04.9% 26.04.9%	(Null)0.0% 28.05.1% 29.05.1% 27.04.9% 26.04.9%	(Null)0.0% 11.010.3% 10.09.5% 12.09.0% 9.08.6%	(Null)0.0% 52.07.4% 53.06.6% 54.05.4% 55.05.1%	(Null)0.0% 12.02.5% 6.02.5% 17.02.5% 20.02.4%	(Null)0.2% 5.05.8% 6.05.7% 7.05.7% 4.05.5%	(Null)0.0% 0.473.5% 0.53.4% 0.513.3% 0.493.2%	(Null)0.0% 5.030.4% 4.022.4% 6.015.7% 3.014.6%	(Null)0.0% 2.035.1% 3.018.5% 1.013.5% 4.010.2%	(Null)0.0% 3.022.9% 4.016.9% 2.015.6% 5.010.8%	(Null)0.0% 16.03.0% 15.02.9% 18.02.9% 17.02.8%	(Null)0.0% 52.07.3% 53.06.4% 54.05.1% 55.04.9%	(Null)100.0%
2021-01-01	2021-01-01T00:00:00+08:00	2021-01-01T00:08:52+08:00	south	rSO	103.82000	1.29587	31.0	31.0	16.0	55.0	32.0	14.0	0.71	7.0	3.0	4.0	14.0	55.0
2021-01-01	2021-01-01T00:00:00+08:00	2021-01-01T00:08:52+08:00	north	rNO	103.82000	1.41803	28.0	28.0	13.0	52.0	51.0	21.0	0.51	5.0	2.0	3.0	3.0	52.0
2021-01-01	2021-01-01T00:00:00+08:00	2021-01-01T00:08:52+08:00	east	rEA	103.94000	1.35735	36.0	36.0	16.0	55.0	35.0	15.0	0.58	6.0	2.0	3.0	10.0	55.0
2021-01-01	2021-01-01T00:00:00+08:00	2021-01-01T00:08:52+08:00	central	rCE	103.82000	1.35735	29.0	29.0	12.0	50.0	22.0	9.0	0.38	4.0	2.0	3.0	8.0	50.0
2021-01-01	2021-01-01T00:00:00+08:00	2021-01-01T00:08:52+08:00	west	rWE	103.70000	1.35735	25.0	25.0	9.0	37.0	14.0	6.0	0.53	5.0	3.0	6.0	17.0	37.0
2021-01-01	2021-01-01T00:00:00+08:00	2021-01-01T00:08:52+08:00	national	NRS	0	0	36.0	36.0	16.0	55.0	51.0	21.0	0.71	7.0	3.0	6.0	17.0	37.0
2021-01-01	2021-01-01T01:00:00+08:00	2021-01-01T01:08:52+08:00	south	rSO	103.82000	1.29587	31.0	31.0	16.0	55.0	38.0	16.0	0.71	7.0	3.0	4.0	10.0	55.0
2021-01-01	2021-01-01T01:00:00+08:00	2021-01-01T01:08:52+08:00	north	rNO	103.82000	1.41803	28.0	28.0	12.0	51.0	51.0	22.0	0.53	5.0	2.0	3.0	17.0	51.0
2021-01-01	2021-01-01T01:00:00+08:00	2021-01-01T01:08:52+08:00	east	rEA	103.94000	1.35735	35.0	35.0	15.0	55.0	36.0	15.0	0.6	6.0	2.0	3.0	6.0	55.0
2021-01-01	2021-01-01T01:00:00+08:00	2021-01-01T01:08:52+08:00	central	rCE	103.82000	1.35735	30.0	30.0	12.0	49.0	25.0	11.0	0.4	4.0	2.0	3.0	6.0	49.0

Column legend

Title	Column name	Data type	Unit of measure	Description
Date	date	Date (YYYY-MM-DD)	-	-
Timestamp	timestamp	Text	-	-
Update Timestamp	update_timestamp	Text	-	-
Region	region	Text	-	-
Region Id	region_id	Text	-	-
Location Longitude	location_longitude	Numeric	-	-
Location Latitude	location_latitude	Numeric	-	-
Pm10 Twenty Four Hourly	pm10_twenty_four_hourly	Numeric	-	-
Pm10 Sub Index	pm10_sub_index	Numeric	-	-
Pm25 Twenty Four Hourly	pm25_twenty_four_hourly	Numeric	-	-

Analyse this dataset with Colab Notebook

1. Copy this dataset ID: d_05b35c51664e1bb6f4dcd78478ae1abe
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Sample OpenAPI query

This code can be used to test a sample API query. It retrieves the data catalogue of this dataset. For a complete guide on query parameters and syntax, please refer to the API documentation. Try it out on your browser to see the response schema.

import requests
          
dataset_id = "d_05b35c51664e1bb6f4dcd78478ae1abe"
url = "https://data.gov.sg/api/action/datastore_search?resource_id="  + dataset_id 
        
response = requests.get(url)
print(response.json())

Citation

This dataset can be reused and cited in research publications.

National Environment Agency. (2025). Historical Pollutant Standards Index (PSI) (2021) (2025) [Dataset]. data.gov.sg. Retrieved April 3, 2026 from https://data.gov.sg/datasets/d_05b35c51664e1bb6f4dcd78478ae1abe/view

About this dataset

Contact

feedback@data.gov.sg

Created on

16 Apr 2025

Licence

Free forever for personal or commercial use, under the Open Data Licence.

Agency

NEA (National Environment Agency)