What is the air quality in Merrimack today?

The current Air Quality Index (AQI) in Merrimack is 43 (Good). PM2.5 concentration is 10.3 µg/m³.

What is the temperature in Merrimack right now?

The current temperature in Merrimack is 20.9°C (feels like 20.9°C). Humidity is 64.2% and wind speed is 51.1 km/h.

Is it safe to go outside in Merrimack?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 9.4 (Very High).

Air Quality in Merrimack, United States

Windy

20.9°C · 64.2% humidity

20.9°

Feels 20.9°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

34 1pm

43 4pm

37 7pm

28 10pm

24 1am

24 4am

24 7am

24 10am

Air Quality Index Trend

47h · 2 stn

View full history →

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

64.2%

Humidity

51.1 km/h

Wind ENE

1015.5 hPa

Pressure

9.4

UV Very High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

10.3 µg/m³

PM10

34.3 µg/m³

050100150200300500

What is the weather forecast for Merrimack?

Temperature & Precipitation

PM2.5 Trend

47h · 2 stations

PM2.510.3 µg/m³ ✓ WHO

Good

PM1034.3 µg/m³

Good

UV INDEX9.4

Very High

Station readings (1 station within 25 km)

10.3

Median

10.3

Average

10.3

Low

10.3

High

PM2.5 µg/m³ · Model: 13.7 · Bias: +3.4

What is the 7-day forecast for Merrimack?

07-21

23.7° 19.3°

2.94 mm

07-22

21.8° 13.7°

19.81 mm

07-23

25.6° 16.8°

1.37 mm

07-24

27.4° 14.7°

3.63 mm

07-25

32.5° 18.6°

7.25 mm

07-26

22.1° 16.2°

2.87 mm

07-27

29.1° 15.9°

1.37 mm

Both models agree Avg diff: 3.5°C

Where are air quality stations near Merrimack?

Londonderry - Moose Hill, New Hampshire, USA

9.2 km PM2.5: 6.0 µg/m³

Londonderry - Moose Hill, New Hampshire, USA

9.2 km PM2.5: 8.6 µg/m³

What cities are near Merrimack?

43 Nashua 42 Derry 42 Derry Village 39 Dracut 38 Methuen 38 Lowell 38 Chelmsford 42 Westford 38 North Andover 38 Tewksbury

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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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 2026-07-21T20:10 UTC.