Worst air pollution Holywood, today and tomorrow
Today (16 July): Air quality in Holywood is fair. AQI, PM2.5, and O3 are fair; PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (O3: 28.9/100).
Tomorrow (17 July 2026): Air quality in Holywood is fair. All pollutants stay as today. Pollution peaks around 12:00 AM (O3: 29.0/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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The air quality picture in Holywood reflects a typical Ards and North Down town, with traffic emissions and local commercial activity as key contributors. Rush-hour queues near the M1 are usually when readings climb the most. Southwesterly winds usually ensure decent dispersal, so levels generally stay within the moderate range typical of UK towns.
Today - 16 July | Pollution peaks at 23:00
AQI:
Fair
28.9/100
PM2.5 (fine particles):
Fair
21.0/100
PM10 (coarse particles):
Good
7.8/100
NO2 (nitrogen dioxide):
Good
0.9/100
O3 (ozone):
Fair
28.9/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.7/100
PM1 (ultrafine particles):
Good
16.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 00:00
AQI:
Fair
29.0/100
PM2.5 (fine particles):
Fair
21.2/100
PM10 (coarse particles):
Good
8.1/100
NO2 (nitrogen dioxide):
Good
2.4/100
O3 (ozone):
Fair
29.0/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
16.3/100
Pollen forecast in Holywood
View pollen forecastFrequently Asked Questions
Is air quality bad in Holywood right now?
On 16 July 2026, overall air quality in Holywood is fair. AQI is the main air quality indicator at 28.9/100. Pollution peaks around 11:00 PM (O3: 28.9/100).
Will air quality be worse tomorrow in Holywood?
On 17 July 2026, air quality conditions in Holywood will be similar to today, with AQI forecast at fair at 29.0/100. Pollution peaks around 12:00 AM (O3: 29.0/100).
When is air pollution at its worst in Holywood?
Air quality in Holywood isn't the same all year round — it really shifts with the seasons. Once the heating goes on and the air turns still, pollution from the M1 and nearby chimneys tends to build up rather than clear. Summer sunshine can drive up ozone locally, though overall air generally moves and clears more freely than in winter. Spring and autumn are typically the easiest months, air-quality-wise, for most residents.
Are air quality levels in Holywood based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Want to see air quality forecasts for other cities in United Kingdom?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app