21 – 27 Oct 2026 · Malaysia

Cheras weekly air quality

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

123.9Weekly mean AQI · Unhealthy for Sensitive Groups

Official DOE API mean: 108.9. 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 AQI compared with the previous week’s eligible mean of 167.9.

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

Daily US AQI (PM2.5)

Low 53High 169AQI

21 Oct27 Oct

27 OctDaily mean · Peak 6262Avg 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	161.3Unhealthy	169	24 / 0
2026-10-22	145Unhealthy for Sensitive Groups	155	24 / 0
2026-10-23	140.9Unhealthy for Sensitive Groups	150	24 / 0
2026-10-24	144.4Unhealthy for Sensitive Groups	152	24 / 0
2026-10-25	97.3Moderate	136	24 / 0
2026-10-26	57.3Moderate	64	24 / 0
2026-10-27	62Moderate	62	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	167	166	166	165	165	163	163	162	162	162	162	162	160	159	159	159	156	158	159	158	158	156	155
2026-10-22	155	154	154	152	152	151	150	148	148	148	147	143	141	141	140	141	138	142	139	136	138	139	141	143
2026-10-23	145	146	147	147	148	150	149	147	144	143	141	141	140	138	134	134	138	136	136	134	136	136	136	136
2026-10-24	136	138	138	141	142	143	146	150	152	152	151	151	151	150	151	148	148	143	141	141	140	138	138	136
2026-10-25	136	132	130	128	122	118	115	109	103	99	97	94	91	90	86	84	81	80	78	77	75	72	70	67
2026-10-26	64	61	59	58	57	56	55	55	55	55	53	53	55	55	57	57	57	57	56	58	59	61	61	62
2026-10-27	62	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

Observation categories

Good: 0

Moderate: 40

Unhealthy for Sensitive Groups: 69

Unhealthy: 36

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

Cheras air quality.
Weekly station review.

21 – 27 Oct 20267 days · Kuala Lumpur

Laporan mingguan Indeks Pencemaran Udara (IPU) bagi stesen Cheras, Kuala Lumpur

During the week of 21 – 27 Oct 2026, air quality at Cheras averaged an Air Pollutant Index (API) of 108.9 (Unhealthy). Readings peaked at 164.

Station weekly average

108.9API

Unhealthy · Tidak Sihat

Daily averages50.2 – 158.6 APIWed → Tue

Explore the week

Week's peak reading: 164UnhealthyPeak during 7-day window
Rank in Kuala Lumpur: #1of 2 stationsState avg: 121.6 API
Good to Moderate air: 46%of hourly readings145 readings recorded
National standing: #49of 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	158.6	154	164
Thu, 22 Oct	127.5	99	154
Fri, 23 Oct	115.8	98	148
Sat, 24 Oct	126.3	99	152
Sun, 25 Oct	77.5	58	99
Mon, 26 Oct	50.2	43	56
Tue, 27 Oct	55	55	55

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 Cheras shows local patterns like traffic peaks and afternoon haze accumulation.

0255075100125150175APIBrighter cells ran hazier than the rest of this week (43 – 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	163	162	162	161	161	160	160	159	159	159	159	159	158	157	157	157	155	156	157	156	156	155	154
Thu	154	153	153	152	152	151	148	142	143	140	136	123	114	112	111	113	100	117	106	99	100	106	114	121
Fri	128	135	138	138	142	148	145	136	127	120	112	112	111	100	98	98	100	99	99	98	99	99	99	99
Sat	99	100	101	113	118	121	133	150	152	152	151	151	151	148	151	141	141	122	114	112	108	103	100	99
Sun	99	97	96	95	92	90	88	85	82	80	79	77	75	74	71	70	68	67	66	65	64	62	60	58
Mon	56	54	53	52	51	49	47	47	47	47	43	43	46	47	51	51	51	51	50	52	53	54	54	55
Tue	55	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

How the readings split

Pecahan bacaan mengikut kategori IPU

GoodBaik7%10
ModerateSederhana39%57
UnhealthyTidak Sihat54%78
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 Cheras

Perbandingan purata mingguan dengan stesen berhampiran

Petaling Jaya114.2 API
Unhealthy12 away
Batu Muda134.2 API
Unhealthy12 away
Shah Alam109.6 API
Unhealthy18 away
Putrajaya115 API
Unhealthy21 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	163	162	162	161	161	160	160	159	159	159	159	159	158	157	157	157	155	156	157	156	156	155	154
Thu	154	153	153	152	152	151	148	142	143	140	136	123	114	112	111	113	100	117	106	99	100	106	114	121
Fri	128	135	138	138	142	148	145	136	127	120	112	112	111	100	98	98	100	99	99	98	99	99	99	99
Sat	99	100	101	113	118	121	133	150	152	152	151	151	151	148	151	141	141	122	114	112	108	103	100	99
Sun	99	97	96	95	92	90	88	85	82	80	79	77	75	74	71	70	68	67	66	65	64	62	60	58
Mon	56	54	53	52	51	49	47	47	47	47	43	43	46	47	51	51	51	51	50	52	53	54	54	55
Tue	55	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

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	163	162	162	161	161	160	160	159	159	159	159	159	158	157	157	157	155	156	157	156	156	155	154
Thu	154	153	153	152	152	151	148	142	143	140	136	123	114	112	111	113	100	117	106	99	100	106	114	121
Fri	128	135	138	138	142	148	145	136	127	120	112	112	111	100	98	98	100	99	99	98	99	99	99	99
Sat	99	100	101	113	118	121	133	150	152	152	151	151	151	148	151	141	141	122	114	112	108	103	100	99
Sun	99	97	96	95	92	90	88	85	82	80	79	77	75	74	71	70	68	67	66	65	64	62	60	58
Mon	56	54	53	52	51	49	47	47	47	47	43	43	46	47	51	51	51	51	50	52	53	54	54	55
Tue	55	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—