Worst air pollution Blackwood, today and tomorrow
Today (20 September): Air quality in Blackwood is moderate. AQI, NO2, and PM1 are moderate; PM2.5 and PM10 are fair; O3, SO2, CO, and HCHO are good. Pollution peaks around 9:00 PM (NO2: 45.5/100).
Tomorrow (21 September 2026): Air quality in Blackwood is poor. AQI worsens to poor; PM2.5 increases to moderate; PM10 increases to moderate; NO2 increases to poor; PM1 increases to poor; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 69.1/100). Airmine updates local air quality forecasts four times daily.
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Blackwood's position in Caerphilly means air quality is mostly determined by local road traffic and the compact scale of the centre. Rush-hour queues near the A470 are usually when readings climb the most. The region's typical south-westerlies do most of the work keeping things in check, more so than any local policy or infrastructure change.
Today - 20 September | Pollution peaks at 21:00
AQI:
Moderate
45.5/100
PM2.5 (fine particles):
Fair
34.0/100
PM10 (coarse particles):
Fair
24.8/100
NO2 (nitrogen dioxide):
Moderate
45.5/100
O3 (ozone):
Good
15.7/100
SO2 (sulfur dioxide):
Good
5.6/100
CO (carbon monoxide):
Good
0.9/100
HCHO (formaldehyde):
Good
8.3/100
PM1 (ultrafine particles):
Moderate
44.6/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 20:00
AQI:
Poor
69.1/100
PM2.5 (fine particles):
Moderate
47.8/100
PM10 (coarse particles):
Moderate
42.3/100
NO2 (nitrogen dioxide):
Poor
69.1/100
O3 (ozone):
Good
17.9/100
SO2 (sulfur dioxide):
Good
13.3/100
CO (carbon monoxide):
Good
1.6/100
HCHO (formaldehyde):
Good
19.8/100
PM1 (ultrafine particles):
Poor
66.8/100
Pollen forecast in Blackwood
View pollen forecastFrequently Asked Questions
Is air quality bad in Blackwood right now?
On 20 September 2026, overall air quality in Blackwood is moderate. AQI is the main air quality indicator at 45.5/100. Pollution peaks around 9:00 PM (NO2: 45.5/100).
Will air quality be worse tomorrow in Blackwood?
On 21 September 2026, air quality conditions in Blackwood will be worse than today, with AQI forecast at poor at 69.1/100. Pollution peaks around 8:00 PM (NO2: 69.1/100).
When is air pollution at its worst in Blackwood?
Spring and autumn usually sit somewhere in between, so it's really the extremes of the year worth watching. In Blackwood, pollution levels don't stay flat — winter and summer look pretty different. Once the heating goes on and the air turns still, pollution from the A470 and nearby chimneys tends to build up rather than clear. Come summer, it's ozone rather than particulates that's the bigger concern, especially on still, sunny days.
Are air quality levels in Blackwood 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 14:33 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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