21 – 27 Oct 2026 · Malaysia

Johor Bahru weekly air quality

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

130.5Weekly mean AQI · Unhealthy for Sensitive Groups

Official DOE API mean: 116. 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

144 eligible observations · 0 excluded.

-50.9 AQI compared with the previous week’s eligible mean of 181.4.

Peak AQI: 177 at Larkin · 24 Oct 2026, 10:00 (UTC+8).

Daily US AQI (PM2.5)

Low 71High 177AQI

21 Oct27 Oct

26 OctDaily mean · Peak 10178.5Avg AQI

Based on 24 hourly readings.

6 of 7 days recorded.

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	152.7Unhealthy	160	24 / 0
2026-10-22	119.9Unhealthy for Sensitive Groups	138	24 / 0
2026-10-23	121Unhealthy for Sensitive Groups	162	24 / 0
2026-10-24	169.3Unhealthy	177	24 / 0
2026-10-25	141.5Unhealthy for Sensitive Groups	159	24 / 0
2026-10-26	78.5Moderate	101	24 / 0
2026-10-27	—Unavailable	—	0 / 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	160	159	159	159	158	158	158	156	156	156	156	155	155	154	152	152	150	148	148	147	145	144	141	138
2026-10-22	138	136	134	132	130	128	126	124	124	122	120	120	117	117	115	115	113	113	111	111	111	107	107	107
2026-10-23	105	105	105	103	103	101	101	101	99	99	99	103	109	115	122	128	134	139	148	152	155	158	159	162
2026-10-24	163	165	166	167	169	170	171	173	174	175	177	177	177	175	174	171	170	170	167	166	165	162	160	160
2026-10-25	159	159	159	158	158	158	156	155	154	152	151	147	142	141	138	136	136	132	126	122	120	117	113	107
2026-10-26	101	97	93	90	86	81	78	77	75	75	75	74	72	72	72	71	71	72	74	75	75	75	77	77
2026-10-27	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

Observation categories

Good: 0

Moderate: 26

Unhealthy for Sensitive Groups: 62

Unhealthy: 56

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

Johor Bahru air quality.
Weekly city review.

21 – 27 Oct 20267 days · Johor

Laporan mingguan Indeks Pencemaran Udara (IPU) bagi bandar Johor Bahru, Johor

Johor Bahru air quality averaged an Air Pollutant Index (API) of 116 (Unhealthy) during the week of 21 – 27 Oct 2026, monitored via the Larkin station.

City weekly average

116API

Unhealthy · Tidak Sihat

Daily averages66.3 – 164.5 APIWed → Mon

Explore the week

Week's highest reading: 170UnhealthyPeak reading during period
Monitoring station: LarkinJohorRepresentative station
Good to Moderate air: 51%of hourly readings144 readings recorded
State & National context: 112.3 APIJohor avgNational avg: 84.6 API

Seven days of air quality in Johor Bahru

Pergerakan purata harian dan julat bacaan sepanjang minggu

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

National averageStation peakMin–max rangeAPI bands6 of 6 points · 0–200 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	146.5	102	158
Thu, 22 Oct	90.7	84	100
Fri, 23 Oct	102.4	80	159
Sat, 24 Oct	164.5	158	170
Sun, 25 Oct	125.3	84	157
Mon, 26 Oct	66.3	61	81

The week, hour by hour

Purata setiap jam sepanjang tujuh hari di stesen berkaitan

Hourly readings at Larkin indicate typical diurnal trends such as morning traffic and afternoon dispersion in Johor Bahru.

050100150200APIBrighter cells ran hazier than the rest of this week (61 – 170 API)

Haziest hour of the week: Sat at 10:00 MYT, averaging API 170 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	158	157	157	157	156	156	156	155	155	155	155	154	154	153	152	152	149	140	140	136	129	124	113	102
Thu	100	99	98	97	96	95	94	93	93	92	91	91	89	89	88	88	87	87	86	86	86	84	84	84
Fri	83	83	83	82	82	81	81	81	80	80	80	82	85	88	92	95	98	104	140	152	154	156	157	159
Sat	160	161	162	163	164	165	166	167	168	169	170	170	170	169	168	166	165	165	163	162	161	159	158	158
Sun	157	157	157	156	156	156	155	154	153	152	151	139	118	112	103	99	99	97	94	92	91	89	87	84
Mon	81	79	76	74	71	68	66	65	64	64	64	63	62	62	62	61	61	62	63	64	64	64	65	65
Tue	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

How readings split

Pecahan bacaan mengikut kategori IPU

GoodBaik0%0
ModerateSederhana51%74
UnhealthyTidak Sihat49%70
Very UnhealthySangat Tidak Sihat0%0
HazardousBerbahaya0%0

Based on 144 hourly station readings.

Health advisory

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

Comparison with nearby cities

Perbandingan purata kualiti udara mingguan dengan bandar berdekatan

Kuala Lumpur109.3 API
UnhealthyLive status →
Kuching108.4 API
UnhealthyLive status →
Alor Setar44.8 API
GoodLive status →

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	158	157	157	157	156	156	156	155	155	155	155	154	154	153	152	152	149	140	140	136	129	124	113	102
Thu	100	99	98	97	96	95	94	93	93	92	91	91	89	89	88	88	87	87	86	86	86	84	84	84
Fri	83	83	83	82	82	81	81	81	80	80	80	82	85	88	92	95	98	104	140	152	154	156	157	159
Sat	160	161	162	163	164	165	166	167	168	169	170	170	170	169	168	166	165	165	163	162	161	159	158	158
Sun	157	157	157	156	156	156	155	154	153	152	151	139	118	112	103	99	99	97	94	92	91	89	87	84
Mon	81	79	76	74	71	68	66	65	64	64	64	63	62	62	62	61	61	62	63	64	64	64	65	65
Tue	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

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	158	157	157	157	156	156	156	155	155	155	155	154	154	153	152	152	149	140	140	136	129	124	113	102
Thu	100	99	98	97	96	95	94	93	93	92	91	91	89	89	88	88	87	87	86	86	86	84	84	84
Fri	83	83	83	82	82	81	81	81	80	80	80	82	85	88	92	95	98	104	140	152	154	156	157	159
Sat	160	161	162	163	164	165	166	167	168	169	170	170	170	169	168	166	165	165	163	162	161	159	158	158
Sun	157	157	157	156	156	156	155	154	153	152	151	139	118	112	103	99	99	97	94	92	91	89	87	84
Mon	81	79	76	74	71	68	66	65	64	64	64	63	62	62	62	61	61	62	63	64	64	64	65	65
Tue	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—