Air Quality in Sintra, Portugal

Windy
18.7°C · 93.6% humidity
18.7°
Feels 18.7°
74
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
63 4am
83
83
74 7am
77
58
60 10am
61
61
62 1pm
82
82
83 4pm
83
63
63 7pm
63
63
63 10pm
56
56
56 1am
56
56
Station readings
71
73
75
75
CAMS model adj +29
34
54
54
54
54
34
34
34
34
34
54
54
54
54
34
34
34
34
34
27
27
27
27
27
AD 728×90

Air Quality Index Trend

48h · 1 stn

Sintra's air quality is shaped by traffic emissions and residential heating. Pollution levels tend to peak during winter months when cold air traps emissions close to ground level. Current PM2.5 concentration in Sintra is 1.5× the WHO 24-hour guideline of 15 µg/m³.

93.6%
Humidity
44.0 km/h
Wind NNW
1018.8 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
74
23.21 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for Sintra?

Temperature & Precipitation

PM2.5 Trend

48h · 1 station
PM2.523.21 µg/m³ ×1.5 WHO
Moderate
PM1027.4 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (2 stations within 25 km)
23.21
Median
14.02
Average
4.8
Low
23.24
High
PM2.5 µg/m³ · Model: 13.5 · Bias: -9.7

What is the 7-day forecast for Sintra?

07-22
20.5° 18.7°
07-23
20.1° 18.7°
1.5 mm
07-24
19.7° 18.6°
07-25
20.3° 18.7°
0.06 mm
07-26
19.6° 18.1°
07-27
20.1° 18.8°
0.06 mm
07-28
21.5° 18.7°
0.19 mm
Both models agree Avg diff: 2.3°C

Where are air quality stations near Sintra?

75
QSintra_Sensor1
0.9 km 21.1°C 78.0% RH PM2.5: 23.3 µg/m³ PM10: 26.1 µg/m³
30
Mem Martins, Sintra, Portugal
3.2 km PM2.5: 7.2 µg/m³
21
Mem Martins, Sintra, Portugal
3.2 km PM2.5: 5.0 µg/m³
9
Aldeia de Juzo
10.0 km 26.1°C 52.0% RH PM2.5: 2.1 µg/m³ PM10: 2.5 µg/m³
11
Entrecampos, Lisboa, Portugal
20.7 km PM2.5: 2.6 µg/m³
24
Olivais, Lisboa, Portugal
23.7 km PM2.5: 5.8 µg/m³
38
Olivais, Lisboa, Portugal
23.7 km PM2.5: 9.1 µg/m³
20
Laranjeiro, Almada, Portugal
24.5 km PM2.5: 4.8 µg/m³
29
Laranjeiro, Almada, Portugal
24.5 km PM2.5: 7.0 µg/m³

What cities are near Sintra?

73 Algueirão 70 Rio de Mouro 64 Cacém 71 Alcabideche 58 Massamá 55 Belas 68 Estoril 68 Monte Estoril 64 São Domingos de Rana 49 Olival
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-22T06:42 UTC.