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9.

Sulphur Dioxide (SO2)

9.1

Conclusions of Phase 1 Review and Assessment

The Council’s Stage 1 Review significant emissions of SO2.

and Assessment did not identify However, further investigation

any sources with potentially of SO2 emissions from the

Colthrop Board Mill was undertaken at Stage 2 to confirm the findings of The Stage 2 report concluded that the AQOs were unlikely to be exceeded. of SO2 emissions was therefore, not required.

the Stage 1 report. Further assessment

9.2

Estimated and Monitored Data

WBC currently does not monitor SO2 concentrations within it’s District. The nearest UK AURN site is located at Reading and represents an urban background location. The site is likely to recorded concentrations similar to those experienced within urbanised areas in West Berkshire. Concentrations of SO2 monitored during 2001 at the Reading site are shown in Table 9.1.

Criteria

Reading

Exceedences

AQO

Maximum 15 minute mean

173

0

266 (not to be exceeded more than 35 times)

Maximum hourly mean

154

0

350 (not to be exceeded more than 24 times)

Maximum 24-hour mean

29

0

125 (not to be exceeded more than 3 times)

Table 9.1

Monitored concentrations 2001 - SO2 (µg/m3)

The monitored concentrations indicate that the maximum 15 minute mean objective of 266 µ g / m 3 , h o u r l y m e a n o b j e c t i v e o f 3 5 0 µ g / m 3 a n d t h e m a x i m u m 2 4 h o u r m e a n o b j e c t i v e o f 1 2 5 µ g / m 3 a r e c u r r e n t l y n o t e x c e e d e d , t h i s i s l i k e l y t o b e t h e c a s e f o r c o n c e n t r a t i o n s i n W e Berkshire. s t

The objectives for SO2 allow a limited number of exceedences of the limit values within a year (as reported in Table 2.1). The 15 minute objective of 266 µg/m3 is considered to be the most stringent objective for SO2 and specifies a maximum of 35 periods within a year that may exceed the 266 µg/m3 objective. Only one site in the AURN network (Belfast East) was reported to exceed this criteria.

h:\projects\em-260\10000 projects\10151 aq w.berks r&a - phase 2\d design\reporting\10151 aq final u&sa.doc10151-01

May 2003

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