Air quality
Air quality in Guarulhos today
Updated
Moderate (US AQI 64) 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 Guarulhos, São Paulo, Brazil, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 64 Moderate
- PM2.5
- 4.5 µg/m³ 0.3× WHO 24-h guideline
- PM10
- 5 µg/m³
- Ozone
- 37 µg/m³
- Dominant pollutant
- PM2.5 sub-index 64
- Best hour tomorrow
- 3:00 pm AQI 31
- European AQI
- 28
Air quality in Guarulhos right now
Right now the modelled US Air Quality Index for Guarulhos, São Paulo, Brazil is 64, 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 PM2.5, whose own sub-index is 64. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.
PM2.5 is 4.5 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 5 µg/m³ against a guideline of 45; ozone is 37 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 16 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 194 µg/m³.
Guarulhos AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 31 around Mon 3:00 pm to 64 around Sun 9:00 pm, from "Good" at best to "Moderate" at worst.
The following day looks similar, averaging about 41.
| Local time (America/Sao_Paulo) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 9:00 pm | 64 | Moderate | 4.5 | 5 | 37 |
| Mon 12:00 am | 55 | Moderate | 6.1 | 7 | 32 |
| Mon 3:00 am | 51 | Moderate | 3.7 | 4 | 44 |
| Mon 6:00 am | 51 | Moderate | 2.7 | 3 | 48 |
| Mon 9:00 am | 47 | Good | 5.5 | 6 | 47 |
| Mon 12:00 pm | 35 | Good | 8.6 | 10 | 56 |
| Mon 3:00 pm | 31 | Good | 8.4 | 10 | 55 |
| Mon 6:00 pm | 32 | Good | 9.5 | 12 | 35 |
| Mon 9:00 pm | 35 | Good | 8.9 | 11 | 34 |
| Tue 12:00 am | 36 | Good | 6.5 | 8 | 32 |
| Tue 3:00 am | 37 | Good | 5.4 | 7 | 32 |
| Tue 6:00 am | 39 | Good | 6.9 | 8 | 26 |
| Tue 9:00 am | 42 | Good | 10.3 | 13 | 61 |
| Tue 12:00 pm | 44 | Good | 9.5 | 13 | 73 |
| Tue 3:00 pm | 45 | Good | 11.3 | 15 | 63 |
| Tue 6:00 pm | 47 | Good | 9.7 | 13 | 36 |
| Tue 9:00 pm | 47 | Good | 10.1 | 13 | 33 |
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 Guarulhos tomorrow
Between 6 am and 9 pm local time, the cleanest air tomorrow is forecast around 3:00 pm (AQI 31, Good) and the worst around 6:00 am (AQI 51). That is a swing of 20 points, so a run or walk around 3:00 pm is noticeably better.
Guarulhos vs the rest of Brazil
Across 144 Brazil cities we track, the average US AQI right now is 52 (Moderate). Guarulhos at 64 is 12 points worse than average.
It ranks 110 of 144 from cleanest to most polluted; the cleanest is Caxias do Sul (24) and the most polluted Manaus (140).
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Guarulhos
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| São Paulo | 14 km | 50 | Good | 4.6 |
| São Caetano do Sul | 18 km | 58 | Moderate | 6.8 |
| Ferraz de Vasconcelos | 19 km | 58 | Moderate | 6.8 |
| Itaquaquecetuba | 19 km | 58 | Moderate | 6.8 |
| Poá | 21 km | 58 | Moderate | 6.8 |
| Santo André | 22 km | 58 | Moderate | 6.8 |
| Mauá | 24 km | 58 | Moderate | 6.8 |
| Suzano | 24 km | 58 | Moderate | 6.8 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Guarulhos, 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 64, most people are fine outdoors. If you are unusually sensitive to PM2.5, 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 Guarulhos
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).