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Air quality · Tamil Nadu

Chennai AQI today चेन्नई

Updated 3 Nov, 17:21 IST.

100 Satisfactory

Live estimate · modelled (CPCB stations offline)

India’s National AQI (CPCB)16:30 IST, 3 Nov Main pollutant: PM10, O₃

Minor breathing discomfort to sensitive people.

Official CPCB bulletin (4 PM today): 65 · Satisfactory · PM10, O₃ ↗

Same day last year (2025, CPCB): 84 · Satisfactory

On the US EPA scale: 56 (Moderate)

What to do today

  • Long walk or run outside OK
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on CPCB’s health statement: “Minor breathing discomfort to sensitive people.” General guidance, not medical advice.

Last 24 hours

17:00 · 35 18:00 · 33 19:00 · 31 20:00 · 29 21:00 · 26 22:00 · 25 23:00 · 24 00:00 · 23 01:00 · 24 02:00 · 30 03:00 · 30 04:00 · 30 05:00 · 34 06:00 · 35 07:00 · 36 08:00 · 39 09:00 · 43 10:00 · 50 11:00 · 59 12:00 · 70 13:00 · 82 14:00 · 95 15:00 · 94 16:00 · 100 Now

Each bar is the city estimate at that hour. Like CPCB, it is a 24-hour average (8 hours for CO and O₃), so the bars move slowly.

Show as a table
TimeAQI
Mon 17:0035
Mon 18:0033
Mon 19:0031
Mon 20:0029
Mon 21:0026
Mon 22:0025
Mon 23:0024
Tue 00:0023
Tue 01:0024
Tue 02:0030
Tue 03:0030
Tue 04:0030
Tue 05:0034
Tue 06:0035
Tue 07:0036
Tue 08:0039
Tue 09:0043
Tue 10:0050
Tue 11:0059
Tue 12:0070
Tue 13:0082
Tue 14:0095
Tue 15:0094
Tue 16:00 · Now100

Pollutants

  • PM2.5 11.9 µg/m³ 20
  • PM10 13.9 µg/m³ 14
  • NO₂ 12.9 µg/m³ 16
  • O₃ 99.5 µg/m³ 100
  • CO 0.29 mg/m³ 15
  • SO₂ 11.5 µg/m³ 14

Modelled for the city (CAMS), not measured: 24-hour averages, 8-hour for CO and O₃, corrected to match CPCB’s recent bulletins.

Last 30 days (official)

Worst: 143 (27 Oct) · Best: 52 (22 Oct)

Last 30 days (official)
6 Oct67 Satisfactory
7 Oct63 Satisfactory
8 Oct60 Satisfactory
9 Oct64 Satisfactory
10 Oct70 Satisfactory
11 Oct75 Satisfactory
12 Oct87 Satisfactory
13 Oct109 Moderate
14 Oct73 Satisfactory
15 Oct69 Satisfactory
16 Oct77 Satisfactory
17 Oct64 Satisfactory
18 Oct58 Satisfactory
19 Oct61 Satisfactory
20 Oct56 Satisfactory
21 Oct54 Satisfactory
22 Oct52 Satisfactory
23 Oct60 Satisfactory
24 Oct61 Satisfactory
25 Oct58 Satisfactory
26 Oct80 Satisfactory
27 Oct143 Moderate
28 Oct115 Moderate
29 Oct104 Moderate
30 Oct108 Moderate
31 Oct83 Satisfactory
1 Nov84 Satisfactory
2 Nov56 Satisfactory
3 Nov65 Satisfactory

CPCB’s official daily AQI (the 4 PM bulletin, a 24-hour average). CPCB ↗

Where this number comes from

CPCB stopped publishing hourly station data in September 2026, so the live estimate is modelled: CAMS forecast concentrations, averaged over CPCB’s own windows, scored with CPCB’s sub-index and scaled to match this city’s recent bulletins. The 4 PM figure is still CPCB’s own measurement.

Full methodology · Population: Chennai

Nearby cities

City AQI
Bengaluru Karnataka 77
Hyderabad Telangana 37
Nagpur Maharashtra 108
Pune Maharashtra 119
Mumbai Maharashtra 104
Indore Madhya Pradesh 68
  • Good 0–50
  • Satisfactory 51–100
  • Moderate 101–200
  • Poor 201–300
  • Very poor 301–400
  • Severe 401–500

Questions

What is Chennai's AQI right now?
Chennai's live estimate is 100 (Satisfactory) at 16:30 IST, 3 Nov, modelled while CPCB’s stations are offline. CPCB's official bulletin (4 PM today) was 65 (Satisfactory).

What is the main pollutant in Chennai today?
PM10, O₃, according to CPCB's official bulletin (4 PM today).

Is it OK to go for a walk in Chennai today?
OK. CPCB's health statement for “Satisfactory”: Minor breathing discomfort to sensitive people. General guidance, not medical advice.

Why do other apps show a different AQI for Chennai?
Many apps use the US EPA scale, on which the same air scores 56 (Moderate). India's National AQI uses different breakpoints, so the two numbers differ even for identical air.