A day in the life of the pollution monitors.


Below is a typical day of data received from the four monitors (PDF’s). Each monitor took readings at different intervals, ranging from every second to every 30 seconds.

The files give readings of both PM2.5, which is the particulate size considered to be not good for your health. Also there is the PM10 range which is pollen size range.

What you can see is how the readings vary throughout the day. The government monitors give an average over 24 hours for their readings, I thought it would be interesting to see how this splits, so you can see the ‘higher highs’ and ‘lower lows’.

Overall as it was mostly winter the ranges were not as high as one would see in the summer. Sometimes you can see ‘waves’ of passing pollution due to the closeness of the readings, it would be interesting to know what these were, perhaps a badly tuned car or lorry for instance.

I am still going through the files and will continue to upload ones of interest.

A typical day – 19th December 2019.


Monitor One 


Monitor Two:


Monitor Three


Monitor Four


Below is a chart giving the ranges of PM2.5 from  UK DEFRA . (Department of Environment, Food and Rural Affairs UK);  

PM2.5 Particles

Index 1 2 3 4 5 6 7 8 9 10
Band Low Low Low Moderate Moderate Moderate High High High Very High
µgm-3 0-11 12-23 24-35 >36-41 >42-47 >48-53 54-58 59-64 65-70 71 or more







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