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Air quality in Ulster

Air quality index (AQI⁺) and PM2.5 air pollution in Ulster • 01:38, Oct 31

Environmental Protection Agency (EPA) of IrelandIreland Air Quality e-Reporting monitoring network for compliance and informative reporting
Environmental Protection Agency (EPA) of IrelandIreland Air Quality e-Reporting monitoring network for compliance and informative reporting

Live most polluted city ranking

Real-time Ulster most polluted city ranking

#CitiesAQI⁺ US
1
The national flag of Ireland

Cavan

54

2
The national flag of Ireland

Letterkenny

53

3
The national flag of Ireland

Monaghan

38

4
The national flag of Ireland

Buncrana

37

5
The national flag of Ireland

Carndonagh

32

Live cleanest city ranking

Real-time Ulster cleanest city ranking

#CitiesAQI⁺ US
1
The national flag of Ireland

Carndonagh

32

2
The national flag of Ireland

Buncrana

37

3
The national flag of Ireland

Monaghan

38

4
The national flag of Ireland

Letterkenny

53

5
The national flag of Ireland

Cavan

54

Wildfires in Ulster

Real-time information

Active fires

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Aerial view of multiple houses covered in haze.
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China Air Quality Alert

Small group of people cycling in morning smog.
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India Air Quality Alert

Polluted skies of Almaty.
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October 28, 2026: Almaty among top 10 most polluted cities in the world

Which is the most polluted city in Ulster?