Figure 13.3: Comparison between PM₁₀ concentrations measured using a high-volume sampler and TEOM with a 50°C sample temperature at Takapuna, Auckland

Text description of figure

This figure has two charts comparing PM₁₀ concentrations measured using a high-volume sampler and those measured using a TEOM at Takapuna, Auckland.

The first chart shows data from October to March (summer). Generally, the two methods record the same results at levels under 10 µgm³. For readings above 10 µgm³ there are growing disparities in measurements between the two methods. From 10 to 20 µgm³ the high volume readings are approximately 2 to 5 µgm³ lower than the TEOM readings. For measurements above 20 µgm³ the disparities increase from 10 to 15 µgm³, following no discernible pattern.

The second chart shows data from April to September (winter). There is an evident and reasonable correlation (R²=0.82) between the different measurement methods.