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Table 2 Exposure Metrics for Weekly Average (Lag06) Apparent Temperature and Air Pollutants during the Warm Season, by California County, 1995-2009 (n = 6497)

From: The impact of high apparent temperature on spontaneous preterm delivery: a case-crossover study

County Case Mean
Apparent
Temperature,
°F (5th, 95th)
Case-Control
Difference
°F
Minimum
Apparent
Temperature,
°F (5th, 95th)
Maximum
Apparent
Temperature,
°F (5th, 95th)
Max O3 a,
ppb (5th ,95th )
Max COa,
ppm (5th,95th)
Max NO2 a,
ppb (5th,95th )
Max SO2 a,
ppb (5th,95th )
Mean PM2.5 a, µg/m3 (5th ,95th )
Alameda 61.7(54.0-70.4) 3 52.9(44.9-59.8) 72.6(61.7-85.1) 39.3(21.5-68.5) 0.9(0.3-2.2) 26.2(9.5-51) 3.3(0.5-8.5) 12.8(5.7-24.1)
Butteb 67.2(49.7-76.5) 6 52(31.9-62.3) 82.7(65.5-92.1) 57.8(37.5-85.5) 0.6(0.4-0.9) 26.6(22-36) N.A. 15.4(2.8-81.3)
Contra Costa 64.6(54.3-75.1) 3.6 52.5(43.3-60.2) 78.7(64.6-92.8) 47.3(27.0-79.5) 0.7(0.3-1.8) 22(9-42.5) 5.0(1.0-13.5) 8.2(4.1-14.4)
El Dorado/Amador 67.6(51.5-83.0) 5.7 54.6(40.6-65.9) 81(60.1-99.3) 70.7(44.0-108.0) 0.5(0.2-1) N.A. N.A. N.A.
Madera 70.7(54.7-95.5) 4.5 54.9(39.9-80.8) 86.3(70.4-109.9) N.A. N.A. N.A. N.A. N.A.
Marin 59.1(51.8-66.1) 3.2 47.6(39.4-54.4) 73.1(60.5-87.4) 32.9(19.5-51.0) 0.9(0.4-2.2) 21.1(11-36.5) N.A. N.A.
Merced 65.1(50.8-74.3) 5.6 48.4(36.4-56.7) 81.5(63.9-94.7) 64.3(43.0-97.0) N.A. N.A. N.A. N.A.
Monterey 57.5(52.8-63.7) 1.3 50.6(45.5-55.9) 66.3(59.7-77.3) 36.0(24.5-52.5) 0.9(0.5-1.6) 15.2(6-32.5) N.A. N.A.
Napa/Lake 60.9(52.1-68.7) 3 46.4(38.5-54.1) 77(63.6-88.8) 43.3(28.5-65.0) 0.8(0.2-2.1) 18.5(7.5-37.5) N.A. N.A.
Nevada/Fresno 73.8(60.8-86.0) 4.4 59.7(48.2-73.1) 87(70.9-99.6) 76.4(45.5-113.0) 0.8(0.2-1.9) 30.4(13-58.5) 4.4(0.5-11.0) 12.1(5.0-27.5)
Placer 69.4(56.1-80.9) 4 56.9(46.4-66.2) 82.6(66.7-95.8) 63.5(37.5-96.5) 0.8(0.3-1.6) 31.6(9.5-61) 2.4(0.5-5.5) N.A.
Sacramento 68.9(56.9-80.2) 4.3 55.6(45.4-64.9) 83.7(68.3-96.4) 61.5(37.0-92.5) 0.9(0.3-2.3) 25.2(8.5-51.5) 3.4(0.5-9.0) 9.6(4.0-17.5)
San Benito 58.7(48.6-69.2) 3 46.9(38.4-58.8) 72.5(59.1-82.5) 48.3(34.0-71.5) N.A. N.A. N.A. N.A.
San Francisco 59.6(53.0-66.1) 2.5 53(47.2-58.6) 68.8(59.4-77.7) 32.3(21.0-45.5) 1.1(0.4-2.4) 24.9(10-51.5) 3.0(0.5-9.0) 11.2(4.8-19.9)
San Joaquin 68.6(56.1-78.8) 4.1 55(43.7-65.4) 83.2(68.1-94.8) 56.0(34.0-83.0) 0.9(0.3-2.1) 30.2(15.3-54.5) N.A. 17.9(9.0-52.0)
San Mateo 59.9(53.3-67.3) 2.7 53.1(47.3-59.7) 68.9(60.7-78.4) 34.1(22.0-51.0) 1(0.4-2.4) 24.1(11.5-42.5) 2.9(0.0-8.5) 10.6(5.0-19.2)
Santa Clara 64.0(55.4-71.8) 3.3 54.2(46.1-61.5) 75.9(64.7-85.7) 43.6(26.5-72.0) 1.2(0.3-3) 32.4(14.5-59.5) 0.7(0.2-1.6) 11.5(5.3-22.3)
Santa Cruz 57.8(52.0-63.4) 1.9 48(43.2-53.5) 69.8(58.7-79.1) 42.1(27.0-64.5 N.A. N.A. N.A. N.A.
Solano 63.5(53.8-73.5) 3.3 51.2(41.6-58.8) 78.1(64.9-91) 44.7(27.0-73.5) 0.8(0.3-2.8) 18.8(7-39) 3.2(1.0-8.5) 8.8(3.8-14.2)
Sonoma/Mendocino 58.5(48.9-66.0) 3.1 43.9(34-51) 76.1(61.7-86.9) 37.7(24.5-55.5) 0.7(0.3-1.7) 20.3(8-37.5) N.A. 5.8(3.7-7.9)
Stanislaus 69.9(59.1-82.7) 4.2 56(45.7-69) 84.7(70.4-97.7) 61.3(36.5-91.5) 0.7(0.1-2.4) 30.7(9.5-66.5) N.A. 6.0(6.0-6.0)
Sutter 66.2(55.5-75.9) 3.2 52.5(42.7-61) 80.2(69.5-90.1) 50.6(23.5-77.5) 1.2(0.2-3.3) 31.7(12-56) N.A. 6.6(3.5-8.5)
Tulare/King 71.9(63.6-81.3) 2.4 56.8(48.4-66.4) 85.7(76.9-96.4) 81.1(48.0-113.0) 0.8(0.5-1.1) 25.7(10.5-53.5) N.A. 12.0(12.0-12.0)
Yolo 68.8(56.3-79.9) 4 54(43.5-63.9) 84.7(67.3-97.8) 58.4(38.5-85.0) 0.6(0.2-1.9) 23.6(10.5-47) N.A. 9.5(4.0-15.5)
Total 64.5(54.2-77.1) 3.5 53.4(43.5-62.8) 77.5(63.2-93.3) 47.5(25-84) 0.9(0.3-2.3) 25.2(9-51) 3.6(0.5-10) 10.6(4.5-20.5)
  1. Abbreviations: CO carbon monoxide, NO 2 nitrogen dioxide, O 3 ozone, SO 2 sulfur dioxide, PM 2.5 particulate matter less than 2.5 lm in aerodynamic diameter
  2. aAir pollution data restricted to monitors within 10 km of cases
  3. b5 Combined counties includes: Butte, Lassen, Shasta, Tehama, Yuba