Air quality

An air quality index (AQI) is a number used by government agencies to communicate to the public how polluted the air currently is or how polluted it is forecast to become. As the AQI increases, an increasingly large percentage of the population is likely to experience increasingly severe adverse health effects. Different countries have their own air quality indices, corresponding to different national air quality standards. For example,

  1. The Irish Environmental Protection Agency uses the Air Quality Index for Health (AQIH)
  2. The United States Environmental Protection Agency has developed their own Air Quality Index (AQI).

The following measurements for Dublin are using both the AQIH and the AQI.

1. Using the Irish Air Quality Index for Health (AQIH)

Overall status in Dublin using AQIH

Data from Air quality monitoring in Dublin

The above assessment is based on an agglomeration of Dublin air quality data from Shankill in south Dublin to Lucan in west Dublin to Swords in north Dublin. For more details of individual sites, see the current readings on the AQIH map at the bottom of this page.

All data is provided courtesy of the Environmental Protection Agency.

Air Quality Index for Health - Colour Coding

The Environmental Protection Agency's Air Quality Index for Health (AQIH) is a number from one to 10 that tells you what the air quality currently is in a region and whether or not this might affect your health.

The AQIH is calculated every hour.

2. Using the US Air Quality Index (AQI)

Details from Rathmines monitoring station

Rathmines monitoring station

The Rathmines site is located in Wynnefield Road in the southern suburb of Rathmines about 3 kilometres from the city centre. Monitoring at this site is done using continuous monitors for sulphur dioxide, nitrogen oxides, ozone, benzene and ozone precursor compounds, PM10 and PM2.5.

What the numbers and colours mean

The numbers are the Air Quality Indexes, which are based on a scale from 0 (good) to 500 (bad).


The colours correspond to the different health impact categories:

Unhealthy for Sensitive Groups
Very Unhealthy

For more information about the pollutants included in the AQI scale, please refer to:

Air Quality Index for Health (AQIH) map for the Republic of Ireland

Click on the map to show more information. Use the 'Show Monitoring Stations' tab to see the location of monitoring stations.


Usage of this map and index constitutes acceptance of the terms and conditions. The index is based on information from monitoring instruments at representative locations in each region. The index will not reflect local incidents of air pollution. Site-specific conditions may give a false index reading. The EPA is not liable for any consequences from decisions made based on this index.

For more details see EPA Air Quality