Swansea’s stadium among Championship’s worst for pollution
Swansea sees one of the biggest traffic drops in the Championship on matchdays, with local congestion around the Swansea.com Stadium falling by 72.7%.
However, despite fewer cars on the road, the stadium is one of the most polluted, due to high average Carbon Monoxide and Methane emission increases.
This is according to new research from SeatPick which reveals the hidden environmental cost of Championship matchdays by analysing traffic patterns and greenhouse gas emissions both in the immediate stadium area and across each club’s town or city.
The findings expose which grounds become the biggest pollution hotspots when fans arrive to watch their team play.
The research shows that Norwich City’s Carrow Road is the most polluted Championship stadium on matchdays, with a pollution score of 9.52/10 and a traffic increase of 129.6%—the highest in the league.
Preston North End’s Deepdale, while having a 15.4% traffic drop, vehicles around the stadium have an average 9.1% increase in Carbon Monoxide and a 0.2% increase in Methane.
Stoke City sees the biggest city-wide traffic surge, with a 104% increase when they play at home, showing how matchdays affect entire urban areas.
Swansea and Watford recorded the biggest city-wide traffic drops (–70% and –74%), but with very different outcomes: Swansea ranks 6th for pollution, while Watford is the cleanest ground in the league (2.31/10).
Coventry City ranks second lowest for pollution (3.27/10), despite a 16.5% traffic increase, highlighting that lower emission matchdays are achievable.
Matchday pollution vs traffic: How do stadiums stack up?
With 24 home fixtures per season per club, the Championship produces hundreds of mass travel events each year. Using a percentile-based ranking system, this table ranks stadiums by matchday pollution scores (out of 10), combining stadium-area traffic changes with CO₂, carbon monoxide, and methane.
#ClubMatchday traffic increase/decreaseAverage CO2 increase/decreaseAverage Carbon Monoxide increase/decreaseAverage Methane increase/decreaseStadium pollution score1Norwich City129.6%0.5%9.6%0.4%
9.522Preston North End-15.4%0.6%9.1%0.2%
9.383West Bromwich Albion-63.1%0.6%11.4%-0.4%
9.094Leeds United-24.4%0.6%7.7%-0.3%
8.875Luton Town-42.1%0.4%8.5%-0.3%
8.496Swansea City-72.7%0.4%4.6%0.3%
8.417Millwall9.1%0.3%8.6%-0.3%
8.338Queens Park Rangers-12.1%0.5%8.4%-1.0%
7.759Plymouth Argyle-59.8%0.2%5.3%0.1%
7.6610Portsmouth8.0%0.3%2.2%-0.2%
7.3911Stoke City108.6%0.2%6.8%-0.8%
7.3012Cardiff City-40.4%0.4%2.0%-0.3%
7.2113Bristol City89.2%0.5%1.2%-0.5%
7.0214=Burnley7.6%0.3%4.9%-0.9%
7.0214=Oxford United-2.5%0.2%5.9%-0.8%
6.8316Blackburn Rovers11.5%0.2%6.8%-1.3%
6.6317Hull City-21.0%0.3%2.8%-0.9%
6.5318Sunderland 77.1%0.2%4.5%-1.4%
5.2919Sheffield United20.2%-0.3%2.1%-0.8%
5.1620Derby County8.8%0.0%1.6%-0.8%
5.0321Sheffield Wednesday13.2%-0.2%2.5%-1.4%
4.6222Middlesbrough1.8%0.1%1.4%-1.3%
4.4723Coventry City-4.7%0.0%0.9%-2.7%
3.2724Watford-72.4%-0.5%0.4%-2.2%
2.31Are Clubs Living Up to Their Green Goals?
The Championship and many top clubs have pledged to cut emissions and improve sustainability in recent seasons. Clubs like Bristol City have pushed for greener stadiums, while clubs such as West Brom and Norwich City are part of the EFL Green Clubs scheme, helping to improve their sustainability practices.
However, the data paints a more complex picture. For example:
- Norwich City is actively working to reduce emissions but currently ranks worst in the league for matchday pollution a score of 9.52/10, largely due to them having the highest stadium-wide traffic increase (129.6%), suggesting that even clubs with strong green commitments still face significant challenges, particularly in tackling fan travel.
- West Bromwich Albion ranks third for pollution, despite a 17.9% drop in city-wide traffic, raising questions about local travel patterns or the type of vehicles in use around The Hawthorns.
- Coventry and Watford perform well, combining low stadium pollution scores with major drops in city-wide traffic. Coventry saw just a 3.27/10 stadium score and only a 16.5% traffic rise, while Watford traffic dropped by 74%, making them standout examples of low-emission matchday behaviour.
This raises the question of how effective current sustainability efforts are, and whether deeper change is needed in fan travel behaviour, stadium planning and local transport partnerships.
Why does it matter?
Championship matchdays happen regularly – every other weekend for nine months of the year – creating a repeating pattern of traffic spikes in some of the UK’s busiest cities.
These effects go beyond stadiums. Stoke-on-Trent, for example, sees a doubling of city-wide traffic on matchdays, with a 104% increase in vehicles when Stoke City play at home, turning an average 20-minute journey into a 38-40 minute journey.
Cities with two Championship clubs feel the strain twice over. In Sheffield, home to Sheffield Wednesday and Sheffield United, matchdays push city-wide traffic up by over 30%—even though traffic around each ground only rises an average of 13–20%. When both sides play at home on the same weekend, it doubles the environmental pressure, turning these fixtures into city-wide disruptions.
For fans, councils and environmental groups, this is a reminder that sport’s impact on the planet doesn’t stop at the turnstiles.
#airPollution #ClubMatchday #Environment #pollution #Swansea #SwanseaCityFC #SwanseaComStadium
