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Air quality · Peru

Arequipa Air Quality Index (AQI) today

Modelled estimate for 07:00 local time (UTC-5), refreshed 3 Nov, 07:52 UTC+0.

70 Moderate

Live estimate · modelled

US EPA AQI07:00 UTC-5, 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 91.

Over the next 24 hours the model expects the AQI to range from 66 around 08:00 to 148 around 13:00 (3 Nov).

385th most polluted of 849 cities worldwide right now, 1st of 5 in Peru.

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

08:00 · 62 09:00 · 67 10:00 · 90 11:00 · 115 12:00 · 135 13:00 · 147 14:00 · 153 15:00 · 153 16:00 · 150 17:00 · 144 18:00 · 128 19:00 · 110 20:00 · 87 21:00 · 74 22:00 · 74 23:00 · 76 00:00 · 76 01:00 · 75 02:00 · 74 03:00 · 72 04:00 · 70 05:00 · 69 06:00 · 71 07:00 · 70 08:00 · 66 09:00 · 66 10:00 · 81 11:00 · 108 12:00 · 133 13:00 · 148 14:00 · 119 15:00 · 118 16:00 · 123 17:00 · 121 18:00 · 108 19:00 · 94 20:00 · 82 21:00 · 71 22:00 · 68 23:00 · 71 00:00 · 73 01:00 · 73 02:00 · 73 03:00 · 72 04:00 · 71 05:00 · 70 06:00 · 69 07:00 · 68 08:00 · 67 09:00 · 70 10:00 · 95 11:00 · 122 12:00 · 141 13:00 · 130 14:00 · 108 15:00 · 90 16:00 · 94 17:00 · 92 18:00 · 85 19:00 · 77 20:00 · 70 21:00 · 68 22:00 · 68 23:00 · 69 00:00 · 71 01:00 · 71 02:00 · 71 Now

US EPA AQI per hour, UTC-5. 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 08:0062
Mon 09:0067
Mon 10:0090
Mon 11:00115
Mon 12:00135
Mon 13:00147
Mon 14:00153
Mon 15:00153
Mon 16:00150
Mon 17:00144
Mon 18:00128
Mon 19:00110
Mon 20:0087
Mon 21:0074
Mon 22:0074
Mon 23:0076
Tue 00:0076
Tue 01:0075
Tue 02:0074
Tue 03:0072
Tue 04:0070
Tue 05:0069
Tue 06:0071
Tue 07:00 · Now70
Tue 08:00 · Forecast66
Tue 09:00 · Forecast66
Tue 10:00 · Forecast81
Tue 11:00 · Forecast108
Tue 12:00 · Forecast133
Tue 13:00 · Forecast148
Tue 14:00 · Forecast119
Tue 15:00 · Forecast118
Tue 16:00 · Forecast123
Tue 17:00 · Forecast121
Tue 18:00 · Forecast108
Tue 19:00 · Forecast94
Tue 20:00 · Forecast82
Tue 21:00 · Forecast71
Tue 22:00 · Forecast68
Tue 23:00 · Forecast71
Wed 00:00 · Forecast73
Wed 01:00 · Forecast73
Wed 02:00 · Forecast73
Wed 03:00 · Forecast72
Wed 04:00 · Forecast71
Wed 05:00 · Forecast70
Wed 06:00 · Forecast69
Wed 07:00 · Forecast68
Wed 08:00 · Forecast67
Wed 09:00 · Forecast70
Wed 10:00 · Forecast95
Wed 11:00 · Forecast122
Wed 12:00 · Forecast141
Wed 13:00 · Forecast130
Wed 14:00 · Forecast108
Wed 15:00 · Forecast90
Wed 16:00 · Forecast94
Wed 17:00 · Forecast92
Wed 18:00 · Forecast85
Wed 19:00 · Forecast77
Wed 20:00 · Forecast70
Wed 21:00 · Forecast68
Wed 22:00 · Forecast68
Wed 23:00 · Forecast69
Thu 00:00 · Forecast71
Thu 01:00 · Forecast71
Thu 02:00 · Forecast71

Pollutants this hour

  • PM2.5 18.9 µg/m³ 24-hour mean 23.1 µg/m³ · 1.5× WHO’s 24-hour guideline (15) 70
  • PM10 79 µg/m³ 60
  • O₃ 37 µg/m³ 6
  • NO₂ 14 µg/m³ 7
  • SO₂ 5 µg/m³ 1
  • CO 0.42 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
La Paz Bolivia 19
Cochabamba Bolivia 20
Sucre Bolivia 21
Lima Lima Province 35
Santa Cruz de la Sierra Bolivia 53
Trujillo La Libertad 39
Chiclayo Lambayeque 43

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 Arequipa’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 Arequipa right now?
70 on the US EPA scale (Moderate) at 07:00 UTC-5, 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 Arequipa 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 Arequipa get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 66 around 08:00 to 148 around 13:00 (3 Nov). Forecasts beyond a day are less certain.

How does Arequipa compare with other cities?
Right now it is the 385th most polluted of 849 cities we track worldwide, and 1st of 5 in Peru, all on the same US EPA scale.

Why does another app show a different AQI for Arequipa?
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.