AQI

Castlereagh Air Quality Index & Realtime Air Pollution

Live AQI
23(AQI-US)
Air Quality is
Good
PM2.5 :5.5µg/m³
PM10 :9.2µg/m³
Good
Moderate
Poor
Unhealthy
Severe
Hazardous
050100150200300301+
Good air quality mascot

Primary Air Pollutants Castlereagh (Northern Ireland)

PM2.56µg/m³
PM2.5
Fine particles
PM109µg/m³
PM10
Coarse particles
SO₂0µg/m³
SO₂
Sulphur dioxide
CO114µg/m³
CO
Carbon monoxide
NO₂3µg/m³
NO₂
Nitrogen dioxide
O₃56µg/m³
O₃
Ozone

Hourly forecast Castlereagh (Northern Ireland)

Now15°
Partly cloudy
01:0015°
Overcast
02:0015°
Partly cloudy
03:0014°
Partly cloudy
04:0014°
Partly cloudy
05:0014°
Overcast
06:0014°
Mostly clear
07:0015°
Partly cloudy
08:0015°
Partly cloudy
09:0016°
Partly cloudy
10:0017°
Partly cloudy
11:0017°
Partly cloudy
12:0018°
Partly cloudy
13:0018°
Partly cloudy
14:0019°
Partly cloudy
15:0019°
Partly cloudy
16:0019°
Mostly clear
17:0019°
Overcast
18:0017°
Partly cloudy
19:0017°
Partly cloudy
20:0016°
Partly cloudy
21:0015°
Partly cloudy
22:0015°
Mostly clear
23:0014°
Mostly clear

Health Recommendations for Castlereagh Residents

Based on current air quality: Good · AQI 23

Good
Air Purifier
Air PurifierTurn Off
Car Filter
Car FilterAdvisable
N95 Mask
N95 MaskAdvisable
Stay Indoor
Stay IndoorAdvisable

UV Index

0

Low

Safe to be outside. Minimal UV risk.

Wind

12.6 km/h

Light breeze — leaves rustling gently.

AQI Graph

Historical AQI Data Castlereagh (Northern Ireland)

23
Min. AQIat 12:00 AM on 21st Jul
36
Max. AQIat 1:00 AM on 20th Jul
20-07-2026Time21-07-2026

United Kingdom’s Major Cities AQI Overview


Most Polluted Cities by AQI United Kingdom

Last Updated: 20 Jul 2026, 23:27

Health Advice For People Living in Castlereagh

0.3
Cigarettes
per day
Weekly2.1 Cigarettes
Monthly9 Cigarettes

Breathing the air in this location is equivalent to smoking 0.3 cigarettes a day.

Disclaimer: This cigarette-equivalent estimate is calculated using the average PM2.5 concentration from the past 24 hours, assuming constant exposure throughout that period.
Solutions for Castlereagh Current AQI (US)
Air Purifier
Air PurifierTurn Off
Car Filter
Car FilterAdvisable
N95 Mask
N95 MaskAdvisable
Stay Indoor
Stay IndoorAdvisable
Must turn on the air purifier to enjoy fresh air.Get an Air Purifier

Prevent Health Problems: Understand Your Risks

Castlereagh · Current air quality: Good · AQI 23

Low Trigger Risk

Headaches

Risk of Headaches symptoms is Low when AQI of Castlereagh is Good (0-50).

Common signs

Typical signs can include: Pressure or tightness around the forehead and temples, Sensitivity to light or smell, Fatigue or difficulty concentrating.

Do’s :
  • Choose indoor, clean indoor air when the AQI is elevated.
  • Stay hydrated and take short breaks from devices or harsh light if you are migraine-prone.
  • If you Make use of prescribed migraine meds, Keep close them accessible.
Don’ts :
  • Try not to do intense outdoor exercise during worse AQI periods.
  • Don’t ignore worsening symptoms that feel unusual for you.

Disclaimer: The health risks mentioned above are precautionary recommendations based on current AQI levels. While you may not experience immediate effects, prolonged exposure to air pollution can lead to these health issues over time. This is not medical advice. Please consult a clinician if you experience severe, unusual, or worsening symptoms.

Air Quality FAQs at Castlereagh, Northern Ireland

The current real-time AQI (US) level in Castlereagh, Northern Ireland is 23 (Good). This was last updated recently.

The best AQI (US) level was generally lower during the early afternoon in the last 24 hours.

The worst AQI (US) level typically peaks during early morning or late evening hours due to temperature inversion.

The AQI (US) levels in Castlereagh, Northern Ireland have been fluctuating throughout the last 24 hours depending on traffic and weather conditions.

Current AQI (US) levels are good for everyone. It's advised to adjust your outdoor activities based on personal sensitivity.