Current air quality on St Marys Lane  (click to interpret)

Classification Period Concentration Index Particle           
Good now 9.98 ug/m3 1 pm10
Good now 1.55 ug/m3 1 pm2.5
      These measurements were taken on: 2021-11-28 03:10

Classification Index pm10 pm2.5 Our measurement values above are real-time values
The health effects should be based on 24 hours average values only.
 Good  1 < 16 μg/m3 < 11 μg/m3 Enjoy your usual outdoor activities
2 < 33 μg/m3 < 23 μg/m3
3 < 50 μg/m3 < 35 μg/m3
 Fair  4 < 58 μg/m3 < 41 μg/m3 Enjoy your usual outdoor activities
Adults and children with lung or heart problems, who experience symptoms, should consider reducing strenuous physical activity, particularly outdoors
5 < 66 μg/m3 < 47 μg/m3
6 < 75 μg/m3 < 53 μg/m3
 Poor  7 < 83 μg/m3 < 58 μg/m3 Anyone experiencing discomfort such as sore eyes, cough or sore throat should consider reducing physical activity, particularly outdoors.

Adults and children with lung problems, and adults with heart problems, should reduce strenuous physical activity, particularly outdoors, and particularly if they experience symptoms.
People with asthma may find they need to use their reliever inhaler more often.
Older people should also reduce physical exertion.
8 < 91 μg/m3 < 64 μg/m3
9 < 100 μg/m3 < 70 μg/m3
 Very poor  10 > 100 μg/m3 > 70 μg/m3 Reduce physical exertion, particularly outdoors, especially if you experience symptoms such as cough or sore throat.
Adults and children with lung problems, adults with heart problems, and older people
should avoid strenuous physical activity.
People with asthma may find they need to use their reliever inhaler more often.
Visit these websites Regional Air Quality site & where you can find a wealth of information
Combining the current PM10 and PM2.5 measurements gives a Daily Air Quality Index of 1

Click to see Defra's forecast of Ecclesfield's "Daily Air Quality Index" for tomorrow (refresh if its map is blank). Otherwise, (when the data loads) see a wind map, a map of Sheffield pm10 values, our 24 hour graph, and a comparison graph below.

● To avoid having to scroll the maps left, use a screen at least 800 pixels wide, and preferably a mouse to hover and show extra information. ● Dragging or swiping either map below scrolls it, not the page. ● Rotating the mouse-wheel over the second map, or clicking + or - zooms that map.

Scale is logarithmic, running from
1μg/m3 1000

● clicking the map, changes the location for the displayed measurements. ●  earth  and  EarthWindMap  bring up new windows.

● If the data does not load, try Luftdaten's old map. ●  PM10, hexagon, (+), and X, icons are all clickable. ● Click to open the above map of air pollution sensors around Ecclesfield.

Update your browser to see a graph of PM10 and PM2.5 pollution levels over the last week.

Click to enlarge the above graph of the air pollution on St Marys Lane

Update your browser to see a graph of PM10 and PM2.5 pollution levels over the last week.

Click to enlarge the above graph of the air pollution at Chambers Grove, Thorncliffe.

To limit exposure

Ecclesfield Air Quality is normally extremely good. We may be able to further reduce our exposure however, by checking that both the current Indexes at the top of this page are "1" before going outdoors or exerting ourselves. The readings may also guide the use of an air filter.

To explain breathing or other problems

We have read that any problems from air pollution are typically triggered by exposure to PM10 accumulated over 24 hours, in which case the average of the Last 24 hours PM10 graph would be the most relevant. However these acute effects of air pollution can last two days, so it might be useful to also switch to Last week's PM10 graph and look back at the day before.

Need to reduce PM2.5

The best estimate of the significance of these readings for the general population that we have found is that our annual risk of death, and the death rate of the people around us, would decrease by 0.6% for each 1μg/m3 reduction in average PM2.5 achieved. Reductions are likely to be even more vital for people suffering from respiratory or cardiovascular conditions, and are also likely to be of greater concern to expectant mothers and parents of growing children. However, in the absence of such specific information, we take the figure above as a measure of the general risk of developing serious medical and psychological problems, making reduction in exposure to particulates a vital concern to everybody.

To identify any local pollution sources

Compare the values in the St Marys Lane graph below with the second graph to get an indication of any North-Sheffield pollution sources (or dispersals). You may also be able to get some idea of location by looking at the direction of the wind across the green circle on the UK map, and perhaps by changing the sensor displayed in the second map. If you can identify any sources, or if you experience any problems or difficulties, or have suggestions, then we would be grateful for an email on

Details of the Sensor

The St. Marys Lane sensor was obtained from Clean Air Sheffield with the assistance of Frack Free Ecclesfield and Chapeltown, and the support of the Ecclesfield Conservation and Local History Group.

You can also see some information about the sensor and its installation. This "PM10" page is made available under the Open Database License: Any rights in individual contents of the database are licensed under the Database Contents License: