21 – 27 Oct 2026 · Malaysia

Petaling Jaya weekly air quality

US AQI · PM2.5 · 24-hour source averages

123.2Weekly mean AQI · Unhealthy for Sensitive Groups

Official DOE API mean: 114.2. Calculated separately from reported official observations.

Each DOE observation identified as PM2.5 is converted using the published API formula and US AQI breakpoints. This is not an official all-pollutant AQI or NowCast. Calculation details

145 eligible observations · 0 excluded.

-44.8 AQI compared with the previous week’s eligible mean of 168.

Peak AQI: 166 at Petaling Jaya · 21 Oct 2026, 00:00 (UTC+8).

Daily US AQI (PM2.5)

Low 53High 166AQI

21 Oct27 Oct

27 OctDaily mean · Peak 5656Avg AQI

Based on 1 hourly readings.

Daily and hourly means use eligible observations across the selected locations. Each observation uses a 24-hour PM2.5 average.

Export AQI CSV

Means and peaks use only converted observations. Missing days remain gaps.

Day	Mean AQI	Peak AQI	Eligible / excluded
2026-10-21	159.7Unhealthy	166	24 / 0
2026-10-22	155.8Unhealthy	159	24 / 0
2026-10-23	155Unhealthy	160	24 / 0
2026-10-24	132.7Unhealthy for Sensitive Groups	147	24 / 0
2026-10-25	84.1Moderate	111	24 / 0
2026-10-26	54.6Moderate	59	24 / 0
2026-10-27	56Moderate	56	1 / 0

Hourly means (UTC+8)

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
2026-10-21	166	165	165	163	162	162	160	160	159	159	158	159	158	158	158	158	156	158	158	158	158	158	158	158
2026-10-22	156	156	156	156	156	155	155	155	154	155	156	155	155	155	155	156	155	156	155	156	156	158	158	159
2026-10-23	159	160	160	160	160	160	160	159	159	156	155	154	155	154	154	154	154	152	152	151	150	148	147	147
2026-10-24	147	146	146	144	142	141	141	145	146	144	142	140	138	134	130	124	120	118	118	117	117	117	115	113
2026-10-25	111	109	107	105	101	99	96	91	88	86	84	81	80	78	77	78	75	74	72	71	68	65	62	61
2026-10-26	59	58	57	55	54	53	53	53	53	53	53	53	54	55	56	54	53	53	53	55	55	56	56	56
2026-10-27	56	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

Observation categories

Good: 0

Moderate: 44

Unhealthy for Sensitive Groups: 33

Unhealthy: 68

Very Unhealthy: 0

Hazardous: 0

US AQI scale
AQI	Category
0–50	Good
51–100	Moderate
101–150	Unhealthy for Sensitive Groups
151–200	Unhealthy
201–300	Very Unhealthy
301+	Hazardous

Petaling Jaya air quality.
Weekly station review.

21 – 27 Oct 20267 days · Selangor

Laporan mingguan Indeks Pencemaran Udara (IPU) bagi stesen Petaling Jaya, Selangor

During the week of 21 – 27 Oct 2026, air quality at Petaling Jaya averaged an Air Pollutant Index (API) of 114.2 (Unhealthy). Readings peaked at 162.

Station weekly average

114.2API

Unhealthy · Tidak Sihat

Daily averages45.9 – 157.3 APIWed → Tue

Explore the week

Week's peak reading: 162UnhealthyPeak during 7-day window
Rank in Selangor: #4of 6 stationsState avg: 106 API
Good to Moderate air: 42%of hourly readings145 readings recorded
National standing: #53of 68 stationsNational avg: 84.4 API

Seven days of station air quality

Pergerakan purata harian dan julat bacaan sepanjang minggu

Archived API · Malaysia TimePoint, tap or use ← → to inspect

National averageStation peakMin–max rangeAPI bands7 of 7 points · 0–175 API

The average follows all available readings each day. The range spans the lowest and highest station readings; a national average can hide local peaks.

View chart data as a table

Archived national API, daily
Date / time	Average	Minimum	Peak
Wed, 21 Oct	157.3	155	162
Thu, 22 Oct	154.7	153	157
Fri, 23 Oct	152.8	136	158
Sat, 24 Oct	107.8	87	137
Sun, 25 Oct	69.7	54	86
Mon, 26 Oct	45.9	42	53
Tue, 27 Oct	49	49	49

The week, hour by hour

Bacaan setiap jam dari tengah malam hingga 11 malam

Read each row from midnight to 11pm, in Malaysia Time. Hourly air quality at Petaling Jaya shows local patterns like traffic peaks and afternoon haze accumulation.

0255075100125150175APIBrighter cells ran hazier than the rest of this week (42 – 162 API)

Haziest hour of the week: Wed at 00:00 MYT, averaging API 162 nationwide.

View the hourly figures as a table

National average API by hour, Malaysia Time
Day	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	162	161	161	160	159	159	158	158	157	157	156	157	156	156	156	156	155	156	156	156	156	156	156	156
Thu	155	155	155	155	155	154	154	154	153	154	155	154	154	154	154	155	154	155	154	155	155	156	156	157
Fri	157	158	158	158	158	158	158	157	157	155	154	153	154	153	153	153	153	152	152	151	148	143	137	136
Sat	137	134	134	126	116	113	114	128	133	124	117	110	100	98	96	93	91	90	90	89	89	89	88	87
Sun	86	85	84	83	81	80	78	75	73	71	70	68	67	66	65	66	64	63	62	61	59	57	55	54
Mon	53	52	51	46	45	43	42	42	42	42	42	42	44	47	50	44	43	43	43	47	48	50	50	50
Tue	49	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

How the readings split

Pecahan bacaan mengikut kategori IPU

GoodBaik15%22
ModerateSederhana27%39
UnhealthyTidak Sihat58%84
Very UnhealthySangat Tidak Sihat0%0
HazardousBerbahaya0%0

Based on 145 hourly station readings.

What it meant for this area

Panduan kesihatan mengikut kategori kualiti udara

Limit prolonged outdoor activity. Children, older adults, pregnant women and people with respiratory or heart conditions should stay indoors where possible. A well-fitted N95 mask helps outdoors.

Hadkan aktiviti luar yang berpanjangan. Kanak-kanak, warga emas, ibu mengandung dan pesakit pernafasan atau jantung dinasihatkan berada di dalam bangunan. Pelitup muka N95 membantu di luar.

Malaysia API scale · Skala IPU Malaysia
API	Category	Kategori
0–50	Good	Baik
51–100	Moderate	Sederhana
101–200	Unhealthy	Tidak Sihat
201–300	Very Unhealthy	Sangat Tidak Sihat
301+	Hazardous	Berbahaya

Nearby monitoring stations around Petaling Jaya

Perbandingan purata mingguan dengan stesen berhampiran

Shah Alam109.6 API
Unhealthy6.5 away
Batu Muda134.2 API
Unhealthy12 away
Cheras108.9 API
Unhealthy12 away
Johan Setia116.8 API
Unhealthy22 away

Day	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	162	161	161	160	159	159	158	158	157	157	156	157	156	156	156	156	155	156	156	156	156	156	156	156
Thu	155	155	155	155	155	154	154	154	153	154	155	154	154	154	154	155	154	155	154	155	155	156	156	157
Fri	157	158	158	158	158	158	158	157	157	155	154	153	154	153	153	153	153	152	152	151	148	143	137	136
Sat	137	134	134	126	116	113	114	128	133	124	117	110	100	98	96	93	91	90	90	89	89	89	88	87
Sun	86	85	84	83	81	80	78	75	73	71	70	68	67	66	65	66	64	63	62	61	59	57	55	54
Mon	53	52	51	46	45	43	42	42	42	42	42	42	44	47	50	44	43	43	43	47	48	50	50	50
Tue	49	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

Day	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	162	161	161	160	159	159	158	158	157	157	156	157	156	156	156	156	155	156	156	156	156	156	156	156
Thu	155	155	155	155	155	154	154	154	153	154	155	154	154	154	154	155	154	155	154	155	155	156	156	157
Fri	157	158	158	158	158	158	158	157	157	155	154	153	154	153	153	153	153	152	152	151	148	143	137	136
Sat	137	134	134	126	116	113	114	128	133	124	117	110	100	98	96	93	91	90	90	89	89	89	88	87
Sun	86	85	84	83	81	80	78	75	73	71	70	68	67	66	65	66	64	63	62	61	59	57	55	54
Mon	53	52	51	46	45	43	42	42	42	42	42	42	44	47	50	44	43	43	43	47	48	50	50	50
Tue	49	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—