30 Sep – 6 Oct 2026 · Malaysia

Johor Bahru weekly air quality

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

136.6Weekly mean AQI · Unhealthy for Sensitive Groups

Official DOE API mean: 124.4. 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

148 eligible observations · 0 excluded.

+17.8 AQI compared with the previous week’s eligible mean of 118.8.

Peak AQI: 175 at Larkin · 30 Sept 2026, 00:00 (UTC+8).

Daily US AQI (PM2.5)

Low 84High 175AQI

30 Sept6 Oct

6 OctDaily mean · Peak 173173Avg AQI

Based on 4 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
2026-09-30	167.3Unhealthy	175	24 / 0
2026-10-01	103.5Unhealthy for Sensitive Groups	151	24 / 0
2026-10-02	95.4Moderate	122	24 / 0
2026-10-03	144.4Unhealthy for Sensitive Groups	154	24 / 0
2026-10-04	145Unhealthy for Sensitive Groups	150	24 / 0
2026-10-05	157.9Unhealthy	171	24 / 0
2026-10-06	173Unhealthy	173	4 / 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
2026-09-30	175	174	174	174	173	171	171	170	170	170	170	170	170	169	169	167	166	165	163	160	159	156	155	154
2026-10-01	151	145	139	134	128	122	118	113	109	103	97	93	88	87	84	84	84	86	86	86	86	87	87	87
2026-10-02	87	87	87	88	88	88	90	90	90	88	88	88	88	90	91	93	96	99	101	107	111	115	118	122
2026-10-03	126	130	132	134	136	138	139	139	140	143	144	146	150	151	152	152	152	154	152	152	152	152	151	149
2026-10-04	148	148	148	148	147	147	148	150	150	150	148	148	145	142	139	140	140	140	140	141	142	143	144	145
2026-10-05	147	148	151	151	152	152	152	152	154	155	155	156	156	158	159	160	162	163	165	165	167	169	170	171
2026-10-06	173	173	173	173	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

Observation categories

Good: 0

Moderate: 32

Unhealthy for Sensitive Groups: 55

Unhealthy: 61

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.

30 Sep – 6 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 124.4 (Unhealthy) during the week of 30 Sep – 6 Oct 2026, monitored via the Larkin station.

City weekly average

124.4API

Unhealthy · Tidak Sihat

Daily averages77.2 – 167 APIWed → Tue

Explore the week

Week's highest reading: 169UnhealthyPeak reading during period
Monitoring station: LarkinJohorRepresentative station
Good to Moderate air: 34%of hourly readings148 readings recorded
State & National context: 106.1 APIJohor avgNational avg: 81.4 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 bands7 of 7 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, 30 Sep	163	153	169
Thu, 1 Oct	84.3	70	151
Fri, 2 Oct	77.2	72	92
Sat, 3 Oct	129.2	94	153
Sun, 4 Oct	130.1	107	150
Mon, 5 Oct	155.5	137	166
Tue, 6 Oct	167	167	167

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 (70 – 169 API)

Haziest hour of the week: Wed at 00:00 MYT, averaging API 169 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	169	168	168	168	167	166	166	165	165	165	165	165	165	164	164	163	162	161	160	158	157	155	154	153
Thu	151	129	104	98	95	92	90	87	85	82	79	76	73	72	70	70	70	71	71	71	71	72	72	72
Fri	72	72	72	73	73	73	74	74	74	73	73	73	73	74	75	76	78	80	81	84	86	88	90	92
Sat	94	96	97	98	99	100	106	106	110	121	124	135	149	151	152	152	152	153	152	152	152	152	151	147
Sun	143	142	142	142	138	137	142	148	150	148	143	141	128	119	107	109	111	111	109	115	119	121	126	131
Mon	137	143	151	151	152	152	152	152	153	154	154	155	155	156	157	158	159	160	161	161	163	164	165	166
Tue	167	167	167	167	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

How readings split

Pecahan bacaan mengikut kategori IPU

GoodBaik0%0
ModerateSederhana34%51
UnhealthyTidak Sihat66%97
Very UnhealthySangat Tidak Sihat0%0
HazardousBerbahaya0%0

Based on 148 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 Lumpur120.5 API
UnhealthyLive status →
Kuching80.1 API
ModerateLive status →
Alor Setar62.3 API
ModerateLive 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	169	168	168	168	167	166	166	165	165	165	165	165	165	164	164	163	162	161	160	158	157	155	154	153
Thu	151	129	104	98	95	92	90	87	85	82	79	76	73	72	70	70	70	71	71	71	71	72	72	72
Fri	72	72	72	73	73	73	74	74	74	73	73	73	73	74	75	76	78	80	81	84	86	88	90	92
Sat	94	96	97	98	99	100	106	106	110	121	124	135	149	151	152	152	152	153	152	152	152	152	151	147
Sun	143	142	142	142	138	137	142	148	150	148	143	141	128	119	107	109	111	111	109	115	119	121	126	131
Mon	137	143	151	151	152	152	152	152	153	154	154	155	155	156	157	158	159	160	161	161	163	164	165	166
Tue	167	167	167	167	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

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	169	168	168	168	167	166	166	165	165	165	165	165	165	164	164	163	162	161	160	158	157	155	154	153
Thu	151	129	104	98	95	92	90	87	85	82	79	76	73	72	70	70	70	71	71	71	71	72	72	72
Fri	72	72	72	73	73	73	74	74	74	73	73	73	73	74	75	76	78	80	81	84	86	88	90	92
Sat	94	96	97	98	99	100	106	106	110	121	124	135	149	151	152	152	152	153	152	152	152	152	151	147
Sun	143	142	142	142	138	137	142	148	150	148	143	141	128	119	107	109	111	111	109	115	119	121	126	131
Mon	137	143	151	151	152	152	152	152	153	154	154	155	155	156	157	158	159	160	161	161	163	164	165	166
Tue	167	167	167	167	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—