21 – 27 Oct 2026 · Malaysia

Shah Alam weekly air quality

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

119.8Weekly mean AQI · Unhealthy for Sensitive Groups

Official DOE API mean: 109.6. 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.

-51 AQI compared with the previous week’s eligible mean of 170.8.

Peak AQI: 169 at Shah Alam · 21 Oct 2026, 00:00 (UTC+8).

Daily US AQI (PM2.5)

Low 52High 169AQI

21 Oct27 Oct

27 OctDaily mean · Peak 5858Avg 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	159.5Unhealthy	169	24 / 0
2026-10-22	153.4Unhealthy	155	24 / 0
2026-10-23	151.6Unhealthy	158	24 / 0
2026-10-24	120.2Unhealthy for Sensitive Groups	138	24 / 0
2026-10-25	81.7Moderate	101	24 / 0
2026-10-26	54.8Moderate	59	24 / 0
2026-10-27	58Moderate	58	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	169	169	167	166	165	163	162	160	160	159	159	159	158	156	156	155	156	156	156	156	156	156	155	155
2026-10-22	155	154	154	154	154	154	154	154	152	152	152	152	152	154	152	154	152	152	152	154	154	155	155	155
2026-10-23	156	156	156	158	158	158	158	158	156	156	155	154	152	152	152	151	152	149	146	142	142	142	141	139
2026-10-24	138	136	136	134	132	132	130	130	130	130	130	128	126	122	117	111	105	103	105	105	101	101	101	101
2026-10-25	101	101	99	97	96	93	90	87	84	83	80	78	77	77	77	77	77	77	74	72	71	68	64	61
2026-10-26	59	57	55	53	52	52	52	52	53	53	54	55	55	54	54	55	55	54	55	56	57	57	58	58
2026-10-27	58	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

Observation categories

Good: 0

Moderate: 47

Unhealthy for Sensitive Groups: 33

Unhealthy: 65

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

Shah Alam air quality.
Weekly station review.

21 – 27 Oct 20267 days · Selangor

Laporan mingguan Indeks Pencemaran Udara (IPU) bagi stesen Shah Alam, Selangor

During the week of 21 – 27 Oct 2026, air quality at Shah Alam averaged an Air Pollutant Index (API) of 109.6 (Unhealthy). Readings peaked at 164.

Station weekly average

109.6API

Unhealthy · Tidak Sihat

Daily averages46.3 – 157.4 APIWed → Tue

Explore the week

Week's peak reading: 164UnhealthyPeak during 7-day window
Rank in Selangor: #3of 6 stationsState avg: 106 API
Good to Moderate air: 50%of hourly readings145 readings recorded
National standing: #51of 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	157.4	154	164
Thu, 22 Oct	152.8	152	154
Fri, 23 Oct	144.7	107	156
Sat, 24 Oct	90.9	81	100
Sun, 25 Oct	68.3	54	81
Mon, 26 Oct	46.3	40	53
Tue, 27 Oct	52	52	52

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 Shah Alam shows local patterns like traffic peaks and afternoon haze accumulation.

0255075100125150175APIBrighter cells ran hazier than the rest of this week (40 – 164 API)

Haziest hour of the week: Wed at 00:00 MYT, averaging API 164 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	164	164	163	162	161	160	159	158	158	157	157	157	156	155	155	154	155	155	155	155	155	155	154	154
Thu	154	153	153	153	153	153	153	153	152	152	152	152	152	153	152	153	152	152	152	153	153	154	154	154
Fri	155	155	155	156	156	156	156	156	155	155	154	153	152	152	152	151	152	146	132	119	119	116	112	107
Sat	100	99	99	98	97	97	96	96	96	96	96	95	94	92	89	86	83	82	83	83	81	81	81	81
Sun	81	81	80	79	78	76	74	72	70	69	67	66	65	65	65	65	65	65	63	62	61	59	56	54
Mon	53	51	46	43	40	41	40	41	42	43	45	47	48	44	45	47	46	45	48	50	51	51	52	52
Tue	52	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

How the readings split

Pecahan bacaan mengikut kategori IPU

GoodBaik12%18
ModerateSederhana38%55
UnhealthyTidak Sihat50%72
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 Shah Alam

Perbandingan purata mingguan dengan stesen berhampiran

Petaling Jaya114.2 API
Unhealthy6.5 away
Johan Setia116.8 API
Unhealthy16 away
Cheras108.9 API
Unhealthy18 away
Batu Muda134.2 API
Unhealthy18 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	164	164	163	162	161	160	159	158	158	157	157	157	156	155	155	154	155	155	155	155	155	155	154	154
Thu	154	153	153	153	153	153	153	153	152	152	152	152	152	153	152	153	152	152	152	153	153	154	154	154
Fri	155	155	155	156	156	156	156	156	155	155	154	153	152	152	152	151	152	146	132	119	119	116	112	107
Sat	100	99	99	98	97	97	96	96	96	96	96	95	94	92	89	86	83	82	83	83	81	81	81	81
Sun	81	81	80	79	78	76	74	72	70	69	67	66	65	65	65	65	65	65	63	62	61	59	56	54
Mon	53	51	46	43	40	41	40	41	42	43	45	47	48	44	45	47	46	45	48	50	51	51	52	52
Tue	52	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

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	164	164	163	162	161	160	159	158	158	157	157	157	156	155	155	154	155	155	155	155	155	155	154	154
Thu	154	153	153	153	153	153	153	153	152	152	152	152	152	153	152	153	152	152	152	153	153	154	154	154
Fri	155	155	155	156	156	156	156	156	155	155	154	153	152	152	152	151	152	146	132	119	119	116	112	107
Sat	100	99	99	98	97	97	96	96	96	96	96	95	94	92	89	86	83	82	83	83	81	81	81	81
Sun	81	81	80	79	78	76	74	72	70	69	67	66	65	65	65	65	65	65	63	62	61	59	56	54
Mon	53	51	46	43	40	41	40	41	42	43	45	47	48	44	45	47	46	45	48	50	51	51	52	52
Tue	52	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—