Dust Management and Monitoring Plan (Sept 2022) (PDF Document, 2.12 Mb)

Our initial PM10 monitor went 'live' on 26th October 2011. Historic data through to 2022 is available for download.

Due to experiencing on-going reliability issues with our original analyser, significantly disrupting sampling over the second half of 2022, we have been phasing the unit out of service. The replacement analyser, which has been positioned at the same location, now allows us also to check concentrations of PM2.5 in addition to PM10. Output from this analyser (dating from 30th July 2022) has been supplied above to satisfy the limited data initially available for the period through to the end of 2022.

'Year-to-date' output(s) from this monitor will now continue be published here on a monthly basis.  Current data for 2023 can be found in the attached document:

Mountsorrel Dust Results (01/01/23 to 28/02/23) (Excel Spreadsheet, 0.1 Mb)

It is often the case that 24-hour episodes of raised PM10 levels observed at the Mountsorrel location coincide with increased concentrations also being recorded at the Automatic Urban and Rural Network (AURN) samplers in Leicester and Nottingham. This is an indicator that some elevated results might be regional and 'transboundary' in nature and therefore not likely to be associated with operations at Mountsorrel Quarry.   The above document also presents graphs to compare the data obtained from these samplers.

2023 Year to Date Number

No. of 24-hour PM10 exceedences (01/01/23 to 28/02/23)

[No more than 35 exceedance of 50 µgm-3 permitted per annum]

No. of valid samples 59
Data capture rate (%) 100
Estimated (pro-rated) exceedences for full year

Average concentrations (µgm-3)

Annual mean concentration AQO [PM2.5] = 20 µgm-3
Annual mean concentration AQO [PM10]  = 40 µgm-3

9.31 [PM2.5]

14.27 [PM10]

PM10 Exceedences in previous years

  • 2022: Data to be finalised due to inadequate data capture.
  • 2021: 07 from 245 valid samples = equivalent of 10 for full year  (avg. conc. = 19.95 µg/m-3)
  • 2020: 05 from 088 valid samples = equivalent of 21 for full year  (avg. conc. = 23.50 µg/m-3)
  • 2019: 09 from 200 valid samples = equivalent of 17 for full year  (avg. conc. = 22.60 µg/m-3) 
  • 2018: 15 from 199 valid samples = equivalent of 28 for full year  (avg. conc. = 24.66 µg/m-3)
  • 2017: 15 from 238 valid samples = equivalent of 23 for full year  (avg. conc. = 24.84 µg/m-3)
  • 2016: 21 from 268 valid samples = equivalent of 29 for full year  (avg. conc. = 24.65 µg/m-3)
  • 2015: 26 from 279 valid samples = equivalent of 34 for full year  (avg. conc. = 27.09 µg/m-3)
  • 2014: 26 from 296 valid samples = equivalent of 33 for full year  (avg. conc. = 25.50 µg/m-3)
  • 2013: 18 from 299 valid samples = equivalent of 22 for full year  (avg. conc. = 24.10 µg/m-3)
  • 2012: 16 from 339 valid samples = equivalent of 18 for full year  (avg. conc. = 22.96 µg/m-3)

Results obtained during our study in 2009/10 (against which results the Air Quality Management Area was declared) showed 60 exceedences in a corresponding period of time from 313 valid sampling days, the equivalent to 70 exceedences per annum.  The annual average concentration for this period was 33.18 µg/m-3.

Results to date would suggest that there has been a significant reduction (approx ~40%) in the average concentration of PM10 at the sampling site (which is considered to be a worse case position) when compared to results prior to the declaration of the Air Quality Management Area (AQMA).

Last updated: Thu 30th March, 2023 @ 15:36