Air quality
Air quality in Cabo Frio today
Updated
Moderate (US AQI 70) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Sun, Oct 25, 9:00 pm (00:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Cabo Frio, Rio de Janeiro, Brazil, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 70 Moderate
- PM2.5
- 14 µg/m³ 0.9× WHO 24-h guideline
- PM10
- 15 µg/m³
- Ozone
- 112 µg/m³
- Dominant pollutant
- ozone sub-index 70
- Best hour tomorrow
- 9:00 pm AQI 46
- European AQI
- 52
Air quality in Cabo Frio right now
Right now the modelled US Air Quality Index for Cabo Frio, Rio de Janeiro, Brazil is 70, which falls in the "Moderate" band (up to 100). Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
The index is driven mainly by ozone, whose own sub-index is 70. Ozone usually peaks in the afternoon on sunny days and falls back after sunset.
PM2.5 is 14 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 15 µg/m³ against a guideline of 45; ozone is 112 µg/m³ (above the WHO 8-hour level of 100); nitrogen dioxide is 5.7 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 174 µg/m³.
NASA FIRMS shows 2 fire hotspots within 300 km in the last day (nearest about 249 km), but particle levels are not elevated enough to point to smoke right now.
Cabo Frio AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 46 around Mon 9:00 pm to 71 around Sun 10:00 pm, from "Good" at best to "Moderate" at worst.
The following day is expected to be cleaner, averaging about 43 against 56 for the next 24 hours.
| Local time (America/Sao_Paulo) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 9:00 pm | 70 | Moderate | 13.5 | 15 | 112 |
| Mon 12:00 am | 65 | Moderate | 10.9 | 14 | 98 |
| Mon 3:00 am | 55 | Moderate | 7.7 | 11 | 81 |
| Mon 6:00 am | 55 | Moderate | 6.6 | 10 | 75 |
| Mon 9:00 am | 54 | Moderate | 8.3 | 12 | 75 |
| Mon 12:00 pm | 53 | Moderate | 7.9 | 12 | 74 |
| Mon 3:00 pm | 52 | Moderate | 5.4 | 9 | 69 |
| Mon 6:00 pm | 50 | Good | 8.3 | 14 | 67 |
| Mon 9:00 pm | 46 | Good | 9.1 | 16 | 62 |
| Tue 12:00 am | 44 | Good | 8.4 | 14 | 60 |
| Tue 3:00 am | 43 | Good | 7.8 | 13 | 58 |
| Tue 6:00 am | 43 | Good | 7.4 | 13 | 60 |
| Tue 9:00 am | 43 | Good | 6.8 | 12 | 69 |
| Tue 12:00 pm | 42 | Good | 6.7 | 12 | 72 |
| Tue 3:00 pm | 42 | Good | 7.3 | 12 | 67 |
| Tue 6:00 pm | 43 | Good | 8.4 | 14 | 60 |
| Tue 9:00 pm | 43 | Good | 10.5 | 18 | 56 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in Cabo Frio tomorrow
Between 6 am and 9 pm local time, the cleanest air tomorrow is forecast around 9:00 pm (AQI 46, Good) and the worst around 6:00 am (AQI 55). The difference across the day is small, so timing matters little.
Cabo Frio vs the rest of Brazil
Across 171 Brazil cities we track, the average US AQI right now is 52 (Moderate). Cabo Frio at 70 is 18 points worse than average.
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Cabo Frio
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| São Gonçalo | 106 km | 68 | Moderate | 12.7 |
| Magé | 107 km | 68 | Moderate | 12.7 |
| Niterói | 110 km | 68 | Moderate | 12.7 |
| Rio de Janeiro | 118 km | 68 | Moderate | 12.7 |
| Petrópolis | 126 km | 53 | Moderate | 7 |
| Duque de Caxias | 132 km | 68 | Moderate | 12.7 |
| Barra da Tijuca | 138 km | 68 | Moderate | 12.7 |
| São João de Meriti | 138 km | 68 | Moderate | 12.7 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Cabo Frio, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Advice for sensitive groups
At 70, most people are fine outdoors. If you are unusually sensitive to ozone, keep long or intense workouts to the cleaner hours shown above.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for Cabo Frio
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.