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Air quality · Vietnam

Hanoi Air Quality Index (AQI) today

Modelled estimate for 19:00 local time (UTC+7), refreshed 3 Nov, 07:52 UTC+0.

94 Moderate

Live estimate · modelled

US EPA AQI19:00 UTC+7, 3 Nov Main pollutant: PM2.5

Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 75.

Over the next 24 hours the model expects the AQI to range from 74 around 19:00 to 161 around 03:00 (4 Nov).

212th most polluted of 849 cities worldwide right now, 1st of 9 in Vietnam.

What to do today

  • Long walk or run outside OK, lighter if very sensitive
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

20:00 · 86 21:00 · 85 22:00 · 85 23:00 · 81 00:00 · 75 01:00 · 69 02:00 · 63 03:00 · 60 04:00 · 58 05:00 · 59 06:00 · 62 07:00 · 68 08:00 · 70 09:00 · 72 10:00 · 72 11:00 · 72 12:00 · 75 13:00 · 77 14:00 · 79 15:00 · 80 16:00 · 80 17:00 · 82 18:00 · 86 19:00 · 94 20:00 · 108 21:00 · 123 22:00 · 136 23:00 · 148 00:00 · 153 01:00 · 156 02:00 · 159 03:00 · 161 04:00 · 161 05:00 · 160 06:00 · 159 07:00 · 160 08:00 · 156 09:00 · 131 10:00 · 107 11:00 · 93 12:00 · 85 13:00 · 82 14:00 · 81 15:00 · 81 16:00 · 80 17:00 · 79 18:00 · 77 19:00 · 74 20:00 · 73 21:00 · 74 22:00 · 75 23:00 · 75 00:00 · 75 01:00 · 76 02:00 · 77 03:00 · 79 04:00 · 80 05:00 · 80 06:00 · 82 07:00 · 83 08:00 · 77 09:00 · 68 10:00 · 65 11:00 · 63 12:00 · 63 13:00 · 63 14:00 · 65 Now

US EPA AQI per hour, UTC+7. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 20:0086
Mon 21:0085
Mon 22:0085
Mon 23:0081
Tue 00:0075
Tue 01:0069
Tue 02:0063
Tue 03:0060
Tue 04:0058
Tue 05:0059
Tue 06:0062
Tue 07:0068
Tue 08:0070
Tue 09:0072
Tue 10:0072
Tue 11:0072
Tue 12:0075
Tue 13:0077
Tue 14:0079
Tue 15:0080
Tue 16:0080
Tue 17:0082
Tue 18:0086
Tue 19:00 · Now94
Tue 20:00 · Forecast108
Tue 21:00 · Forecast123
Tue 22:00 · Forecast136
Tue 23:00 · Forecast148
Wed 00:00 · Forecast153
Wed 01:00 · Forecast156
Wed 02:00 · Forecast159
Wed 03:00 · Forecast161
Wed 04:00 · Forecast161
Wed 05:00 · Forecast160
Wed 06:00 · Forecast159
Wed 07:00 · Forecast160
Wed 08:00 · Forecast156
Wed 09:00 · Forecast131
Wed 10:00 · Forecast107
Wed 11:00 · Forecast93
Wed 12:00 · Forecast85
Wed 13:00 · Forecast82
Wed 14:00 · Forecast81
Wed 15:00 · Forecast81
Wed 16:00 · Forecast80
Wed 17:00 · Forecast79
Wed 18:00 · Forecast77
Wed 19:00 · Forecast74
Wed 20:00 · Forecast73
Wed 21:00 · Forecast74
Wed 22:00 · Forecast75
Wed 23:00 · Forecast75
Thu 00:00 · Forecast75
Thu 01:00 · Forecast76
Thu 02:00 · Forecast77
Thu 03:00 · Forecast79
Thu 04:00 · Forecast80
Thu 05:00 · Forecast80
Thu 06:00 · Forecast82
Thu 07:00 · Forecast83
Thu 08:00 · Forecast77
Thu 09:00 · Forecast68
Thu 10:00 · Forecast65
Thu 11:00 · Forecast63
Thu 12:00 · Forecast63
Thu 13:00 · Forecast63
Thu 14:00 · Forecast65

Pollutants this hour

  • PM2.5 37.0 µg/m³ 24-hour mean 22.1 µg/m³ · 1.5× WHO’s 24-hour guideline (15) 94
  • PM10 38 µg/m³ 30
  • O₃ 53 µg/m³ 67
  • NO₂ 48 µg/m³ 24
  • SO₂ 40 µg/m³ 21
  • CO 0.97 mg/m³ 6

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
Haiphong Hai Phong 64
Thanh Hóa Thanh Hóa Province 66
Vinh Nghệ An Province 59
Nanning China 74
Vientiane Laos 60
Huế Thừa Thiên Huế Province 64
Kunming China 51

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at Hanoi’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in Hanoi right now?
94 on the US EPA scale (Moderate) at 19:00 UTC+7, 3 Nov. PM2.5 is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in Hanoi today?
For most people, yes. The EPA’s statement for “Moderate”: Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. General guidance, not medical advice.

Will the air in Hanoi get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 74 around 19:00 to 161 around 03:00 (4 Nov). Forecasts beyond a day are less certain.

How does Hanoi compare with other cities?
Right now it is the 212th most polluted of 849 cities we track worldwide, and 1st of 9 in Vietnam, all on the same US EPA scale.

Why does another app show a different AQI for Hanoi?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.