Current Anglesey Air Quality
Anglesey, Wales PM2.5 air quality averaged 5.7 micrograms in 2021. This means Anglesey, Wales PM2.5 concentrations just exceeded the WHO annual limit of 5 micrograms by 14%. On the most polluted day, air quality exceeded the recommended limit by a little under 6 times.
Current Air Quality in Anglesey
42% of Days in Anglesey More Polluted Than WHO Target
During 2021, 42% of days exceeded the WHO annual limit. 58% of days fell within the safe limit of 5 micrograms. That means outdoor air in Anglesey was considered safe for 3 in 5 days during 2021.
The most polluted day in 2021 was Wednesday, 3 March, where PM2.5 concentrations were as high as 29.8 micrograms, exceededing the recommended limit by a little under 6 times.
Anglesey PM2.5 Concentrations: 2022 – Year to Date
So far in 2021, Anglesey’s PM2.5 concentrations have averaged 8.1 micrograms. That’s 42% higher than the previous year.
Historical Air Quality Readings for Anglesey
Is Anglesey Air Quality Improving?
In the last four years, data shows little improvement in Anglesey air quality. Although 2020 saw a near 12% improvement from 2019, 2021 pollution worsened from 2020 PM2.5 levels. Anglesey’s annual level of air pollution consistently hovers around the WHO limit.
Wednesday is the Most Polluted Day of the Week in Anglesey, Wales
Wednesdays are the most polluted day of the week in Anglesey, Wales. PM2.5 levels on an average Wednesday reach 6.8 micrograms. That’s 10% higher than the least polluted day – Saturday. On Saturday, PM2.5 air pollution averages 6.2 micrograms.
On average, Wednesdays see PM2.5 pollution that’s 136% the WHO limit. For Saturdays – the least polluted day – PM2.5 air pollution is 124%.
Why Is the Air Quality Bad Day to Day in Anglesey?
Weather plays a big role in how the air quality is in Anglesey each day. Heat and sunlight help create ozone. That’s why ozone pollution is higher during the day and during hotter months. Studies show rain can reduce PM2.5 air pollution a little, but strong winds usually reduce PM2.5 much more.
Research has found that PM2.5 around the world follows a daily pattern. Of course, any particular day can be an exception. However, across continents, PM2.5 pollution tends to be worse from 8pm to 2am, with another bad spike around morning rush hour. PM2.5 is the lowest around 4pm, when air tends to mix higher in the atmosphere.

Anglesey Air Pollution: The Negative Health Effects

This analysis of Anglesey’s air quality is based on PM2.5 pollution. These are particles smaller than 2.5 microns in diameter that can penetrate deep into the lungs and even enter the bloodstream.
Many people know that air pollution causes lung cancer and asthma. But fewer people know that air pollution kills far more people through our hearts and blood vessels.
Studies have shown that PM2.5 raises blood pressure, inflammation, and rates of heart attacks and strokes.
WATCH: Why Is PM2.5 So Harmful to Us?
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Protect Your Health in Anglesey From Air Pollution
Despite the harms of PM2.5 air pollution, studies of air purifiers have found that removing particulate in the home lowers blood pressure, reduces inflammation, and improves immune response.
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