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Table 2 Distribution of hourly pollutant concentrations and weather characteristics (lag hour 0 of control periods) by period

From: Changes in triggering of ST-elevation myocardial infarction by particulate air pollution in Monroe County, New York over time: a case-crossover study

  Percentile
Pollutant N Mean SD IQR Minimum 5th 25th 50th 75th 95th Maximum
PM2.5 (μg/m3)
 All years (2005–2016) 2900 8.32 7.17 7.59 −7.85 0.19 3.63 6.83 11.22 21.86 76.15
 Before (2005–2007) 788 10.37 8.74 8.40 −3.31 0.86 4.84 8.22 13.24 26.79 76.15
 During (2008–2013) 1134 8.31 6.83 7.60 −3.94 0.25 3.80 6.75 11.40 21.87 47.15
 After (2014–2016) 978 6.67 5.55 6.60 −7.85 −0.36 2.76 5.69 9.35 16.80 48.65
AMP (particles/cm3)
 All years (2005–2016) 2680 781 658 698 10 138 327 610 1025 1978 6578
 Before (2005–2007) 566 1139 908 980 62 179 481 940 1461 2960 6015
 During (2008–2013) 1156 739 596 672 32 140 317 586 988 1797 6578
 After (2014–2016) 958 620 440 554 10 122 282 527 836 1469 2926
UFP (particles/cm3)
 All years (2005–2016) 2680 4286 3775 3702 70 738 1777 3232 5479 11,708 41,965
 Before (2005–2007) 566 6916 5247 6046 325 1300 3235 5405 9281 16,720 41,965
 During (2008–2013) 1156 3492 2832 3141 191 585 1466 2798 4606 8642 20,826
 After (2014–2016) 958 3690 2958 2951 70 774 1728 2923 4679 9212 31,417
UFP(11-50 nm)(particles/cm3)
 All years (2005–2016) 2680 2963 2906 2755 30 392 1087 2106 3842 8588 32,747
 Before (2005–2007) 566 4839 3958 4327 158 845 2015 3762 6342 12,708 32,747
 During (2008–2013) 1156 2385 2148 2260 117 327 886 1770 3146 6515 17,182
 After (2014–2016) 958 2552 2485 2182 30 419 1035 1805 3217 7202 29,559
UFP(50-100 nm)(particles/cm3)
 All years (2005–2016) 2680 1323 1242 1161 14 199 532 979 1693 3628 11,198
 Before (2005–2007) 566 2077 1824 1701 73 316 878 1568 2579 5940 11,198
 During (2008–2013) 1156 1107 972 963 48 174 470 842 1433 2943 8650
 After (2014–2016) 958 1138 886 1016 14 185 504 905 1521 2851 6309
BC (μg/m3)
 All years (2005–2016) 3039 0.49 0.47 0.44 −0.07 0.06 0.19 0.36 0.63 1.36 5.31
 Before (2005–2007) 783 0.69 0.60 0.63 −0.02 0.09 0.28 0.53 0.91 1.84 5.31
 During (2008–2013) 1226 0.50 0.44 0.46 −0.07 0.08 0.21 0.37 0.66 1.34 3.74
 After (2014–2016) 1030 0.33 0.28 0.30 −0.04 0.04 0.14 0.25 0.44 0.92 2.13
SO2 (ppb)
 All years (2005–2016) 3006 1.98 3.10 1.77 −0.09 0.09 0.32 1.00 2.09 7.00 68.00
 Before (2005–2007) 822 4.11 4.41 3.00 0.00 1.00 2.00 3.00 5.00 11.00 68.00
 During (2008–2013) 1179 1.54 2.20 1.70 −0.09 0.01 0.30 0.97 2.00 5.00 21.00
 After (2014–2016) 1005 0.76 1.33 0.54 0.00 0.09 0.20 0.37 0.74 2.61 16.35
O3 (ppb)
 All years (2005–2016) 2992 26.6 14.1 18.0 0.0 2.0 17.0 26.0 35.0 50.0 83.0
 Before (2005–2007) 828 21.9 14.6 21.0 0.0 1.0 10.0 21.0 31.0 49.0 77.0
 During (2008–2013) 1162 28.1 14.0 16.0 0.0 4.0 20.0 28.0 36.0 51.0 83.0
 After (2014–2016) 1002 28.9 12.9 17.0 0.0 6.0 20.0 29.0 37.0 50.0 72.0
CO (ppm)
 All years (2005–2016) 2939 0.30 0.20 0.23 −0.01 0.12 0.17 0.22 0.40 0.65 2.50
 Before (2005–2007) 814 0.48 0.22 0.30 0.10 0.20 0.30 0.40 0.60 0.80 2.50
 During (2008–2013) 1124 0.26 0.16 0.14 0.00 0.12 0.16 0.20 0.30 0.60 1.10
 After (2014–2016) 1001 0.20 0.07 0.06 −0.01 0.12 0.16 0.19 0.22 0.33 1.02
Temperature (°F)
 All years (2005–2016) 3065 50.7 20.3 32.1 −5.0 19.2 34.8 50.0 66.9 83.7 96.4
 Before (2005–2007) 839 48.4 18.9 30.5 1.4 20.2 33.2 46.9 63.7 78.7 95.9
 During (2008–2013) 1196 49.5 20.2 32.1 4.8 20.1 33.4 46.6 65.5 84.9 96.4
 After (2014–2016) 1030 53.9 21.0 32.9 −5.0 17.5 38.0 55.3 70.9 84.3 92.6
Relative Humidity
 All years (2005–2016) 3064 64.5 19.9 32.0 7.1 30.0 49.0 66.3 81.0 93.0 102.0
 Before (2005–2007) 838 69.6 19.0 28.0 7.1 35.0 58.0 73.0 86.0 93.4 98.2
 During (2008–2013) 1196 64.1 19.5 31.0 12.0 30.0 49.0 66.0 80.0 93.0 102.0
 After (2014–2016) 1030 60.9 20.1 32.0 15.0 29.0 45.0 61.0 77.0 93.0 99.0
  1. Number of total control periods = 3122; Number of control periods in the Before, During, and After period were 839, 1250, and 1033, respectively
  2. SD standard deviation, IQR interquartile range