What is the air quality in Princeton today?

The current Air Quality Index (AQI) in Princeton is 18 (Good). PM2.5 concentration is 4.19 µg/m³.

What is the temperature in Princeton right now?

The current temperature in Princeton is 12.2°C (feels like 12.2°C). Humidity is 59.6% and wind speed is 58.6 km/h.

Is it safe to go outside in Princeton?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 12.9 (Extreme).

Air Quality in Princeton, United States

Windy

12.2°C · 59.6% humidity

12.2°

Feels 12.2°

Good

Air quality is satisfactory. Enjoy outdoor activities.

3 stations

Nearby Monitoring Stations

AQI Forecast

24 7am

18 10am

22 1pm

23 4pm

25 7pm

25 10pm

24 1am

24 4am

Air Quality Index Trend

48h · 1 stn

View full history →

Princeton's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

59.6%

Humidity

58.6 km/h

Wind NNE

1022.3 hPa

Pressure

12.9

UV Extreme

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.19 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Princeton?

Temperature & Precipitation

PM2.5 Trend

48h · 1 station

PM2.54.19 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX12.9

Extreme

Station readings (3 stations within 25 km)

4.19

Median

4.17

Average

3.4

Low

4.8

High

PM2.5 µg/m³ · Model: 5.8 · Bias: +1.6

What is the 7-day forecast for Princeton?

05-29

18.7° 11.9°

0.06 mm

05-30

24.0° 11.2°

5.75 mm

05-31

29.0° 8.0°

06-01

25.5° 10.8°

0.19 mm

06-02

21.0° 11.1°

06-03

25.1° 16.7°

2.31 mm

06-04

22.6° 19.0°

1.69 mm

Both models agree Avg diff: 4.3°C

Where are air quality stations near Princeton?

Rider University, NewJersey, USA

10.2 km PM2.5: 4.1 µg/m³

Rider University, NewJersey, USA

10.2 km PM2.5: 2.2 µg/m³

Rider University, NewJersey, USA

10.2 km PM2.5: 5.8 µg/m³

Rider University, NewJersey, USA

10.2 km PM2.5: 2.6 µg/m³

Flemington, NewJersey, USA

22.3 km PM2.5: 4.8 µg/m³

Flemington, NewJersey, USA

22.3 km PM2.5: 9.1 µg/m³

Flemington, NewJersey, USA

22.3 km PM2.5: 5.0 µg/m³

Flemington, NewJersey, USA

22.3 km PM2.5: 4.1 µg/m³

Flemington, NewJersey, USA

22.3 km PM2.5: 9.6 µg/m³

Rutgers University, NewJersey, USA

23.2 km PM2.5: 6.0 µg/m³

What cities are near Princeton?

24 Mercerville-Hamilton Square 18 Hillsborough 15 Ewing 15 Trenton 15 North Brunswick 15 Somerset 15 East Brunswick 15 New Brunswick 15 South River 15 Old Bridge

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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 2026-05-29T14:46 UTC.