Special Additional Pollution Measures (SAPM) Study - Initial Report November 2011
Summary
Initial report - Assessment and cross-calibration of OSIRIS monitors (May – September 2011) Conclusions • All instruments performed well and no mechanical difficulties were encountered. Apart from monthly filter changes no further maintenance was required. • Differences in clock timings between instruments, which could have influenced the ongoing program were recognised and a strategy has been implemented which should eliminate this issue for the ongoing project. • A high degree of correlation between the OSIRIS instruments was measured, differences between machine outputs were small. The robustness of this outcome should confidently allow adjustment (normalisation) of results from the individual instruments in this ongoing program. • Comparison of 24 hour averaged PM10 results from the OSIRIS and from a co-located TEOM show a strong correlation and a slope of 0.98. • Conversely, 24 hour averaged PM2.5 results from the OSIRIS and a co-located BAM show a great deal of divergence from linearity (R²= 0.43) and a slope of 1.60. These results suggest that it will be difficult to compare OSIRIS and BAM results in the longer trial period. A three month co-location of three OSIRIS particle analysers was carried out at the OEH monitoring site at Singleton.
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