On the Optimum Sampling Time for the Measurement of Pollutants in Ambient Air

<table>The measured PM<sub>10</sub> mass concentration at Marylebone Road in London during 2006 displayed, from top
to bottom: hourly (offset by +400 <svg height="10.725" id="M91" style="vertical-align:-2.7337pt" version="1.1" viewbox="0 0 17.4625 10.725" width="17.4625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.725)">
<g transform="translate(72,-63.42)">
<text transform="matrix(1,0,0,-1,-71.95,66.2)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝜇</tspan>
<tspan style="font-size: 12.50px; " x="7.6018238" y="0">g</tspan>
</text>
</g>
</g>
</svg> ⋅ m<sup>−3</sup>), six-hourly (offset by +300 <svg height="10.725" id="M92" style="vertical-align:-2.7337pt" version="1.1" viewbox="0 0 17.4625 10.725" width="17.4625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.725)">
<g transform="translate(72,-63.42)">
<text transform="matrix(1,0,0,-1,-71.95,66.2)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝜇</tspan>
<tspan style="font-size: 12.50px; " x="7.6018238" y="0">g</tspan>
</text>
</g>
</g>
</svg> ⋅ m<sup>−3</sup>), daily (offset by +200 <svg height="10.725" id="M93" style="vertical-align:-2.7337pt" version="1.1" viewbox="0 0 17.4625 10.725" width="17.4625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.725)">
<g transform="translate(72,-63.42)">
<text transform="matrix(1,0,0,-1,-71.95,66.2)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝜇</tspan>
<tspan style="font-size: 12.50px; " x="7.6018238" y="0">g</tspan>
</text>
</g>
</g>
</svg> ⋅ m<sup>−3</sup>), weekly (offset by +100 <svg height="10.725" id="M94" style="vertical-align:-2.7337pt" version="1.1" viewbox="0 0 17.4625 10.725" width="17.4625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.725)">
<g transform="translate(72,-63.42)">
<text transform="matrix(1,0,0,-1,-71.95,66.2)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝜇</tspan>
<tspan style="font-size: 12.50px; " x="7.6018238" y="0">g</tspan>
</text>
</g>
</g>
</svg> ⋅ m<sup>−3</sup>), and monthly no soffset. </table>

Journal of Analytical Methods in Chemistry

fig5

Figure 5

Figure 5: On the Optimum Sampling Time for the Measurement of Pollutants in Ambient Air 