#TITLE: Field trial of instruments #DESCRIPTION: 8 Colocated instruments measuring the same aspect of air pollution over a 44 day period. #VARIABLES: Not disclosed #UNITS: Not disclosed. #REFERENCE_VALUES: None #APPLICATION_SECTOR: Air pollution #ANALYTE: Not disclosed #MATRIX_TYPE: Air #RATIONALE: Validate measurement concept? #DATA_TYPE: Anonymised #DATA_STRUCTURE: Day crossed with instrument, single observations. #CONDITIONS: #ORIGIN: National Physical Laboratory, Teddington, Middlesex, UK TW11 0LW #DATE_OF_ORIGIN: September 2007 #AUTHOR: Richard Brown #AUTHOR_ADDRESS: National Physical Laboratory, Teddington, Middlesex, UK TW11 0LW #LITERATURE_REFERENCES: Day Inst 1 Inst2 Inst 3 Inst 4 Inst 5 Inst 6 Inst 7 Inst 8 1 9.290 9.079 10.109 12.011 4.361 1.672 6.151 3.805 2 8.147 7.912 7.916 10.747 3.594 1.268 5.696 4.107 3 7.916 7.423 8.069 9.999 3.163 3.418 5.591 4.706 4 8.511 7.435 8.699 10.712 4.025 2.600 5.967 4.330 5 15.789 17.120 16.819 20.206 8.507 5.395 16.228 13.178 6 9.936 9.795 10.195 12.344 5.743 3.633 8.135 7.094 7 7.505 6.918 7.454 9.036 4.502 2.760 5.289 4.213 8 7.501 7.501 7.709 9.666 4.498 2.905 5.908 4.953 9 8.331 5.661 8.417 10.363 4.596 2.944 6.135 4.510 10 7.650 7.380 7.536 9.353 4.154 2.756 5.689 4.459 11 9.408 9.647 8.879 11.757 5.070 3.179 5.591 4.263 12 9.204 9.987 9.380 10.680 6.714 3.574 5.779 4.432 13 8.417 8.351 8.151 9.627 4.463 2.799 6.147 5.113 14 8.918 8.907 8.727 10.250 4.604 2.807 6.053 4.248 15 8.120 8.151 7.881 9.196 4.310 2.572 5.454 3.888 18 11.690 11.209 11.816 13.722 5.125 3.116 7.118 3.950 19 8.883 8.147 9.639 11.252 4.491 3.183 7.063 4.044 20 8.562 7.975 9.134 10.766 4.244 2.682 7.004 3.970 21 8.182 7.756 8.727 10.340 4.040 2.568 6.354 3.473 22 8.018 8.496 8.652 10.351 4.244 2.549 7.031 5.285 23 9.968 11.405 12.516 14.466 5.583 3.257 8.175 7.106 24 8.159 8.734 9.341 11.753 4.322 2.650 6.397 5.442 25 7.603 8.069 8.456 10.567 4.216 2.549 6.080 4.252 26 7.681 8.253 8.363 10.625 4.307 2.662 5.759 3.449 27 6.984 7.278 7.591 9.521 3.935 2.384 5.767 3.880 28 7.951 8.476 8.464 10.618 4.538 2.623 6.374 4.068 29 7.787 9.259 8.734 10.943 4.604 2.756 6.303 3.715 30 7.039 8.734 8.257 10.320 4.565 4.420 6.452 4.123 31 9.431 10.418 9.698 11.957 4.620 16.283 9.792 7.771 32 8.699 8.731 8.793 10.759 4.385 9.897 9.400 7.552 33 8.492 8.460 8.378 10.230 3.813 8.868 8.453 6.620 34 8.041 7.599 7.673 9.365 3.950 6.714 7.298 5.614 35 13.808 7.489 7.556 8.856 3.715 4.463 6.221 4.506 36 14.450 7.536 7.603 8.918 3.602 5.759 6.307 4.263 37 9.529 9.424 9.087 10.637 4.420 6.107 7.278 4.342 38 8.781 8.014 7.948 9.416 3.939 4.091 6.761 4.307 39 8.480 7.603 7.666 8.989 3.473 3.351 6.597 4.381 40 8.496 7.247 7.771 9.095 3.755 3.218 6.945 4.502 41 9.909 9.228 9.576 11.264 4.487 3.073 10.316 7.611 42 8.135 7.744 7.439 8.891 4.072 2.357 7.027 5.168 43 8.590 8.108 7.533 9.028 4.119 2.846 6.659 4.224 44 9.557 9.972 9.083 10.970 5.970 4.068 9.435 6.859