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Table 2 Descriptive statistics of meteorological parameters and air pollutants in the urban area of Beijing by time period

From: Associations between air temperature and cardio-respiratory mortality in the urban area of Beijing, China: a time-series analysis

Time period

Meteorological parameter/air pollutant

Mean ± SD

Min

1st Qu

Median

3rd Qu

Max

Warm

Air temperature (°C)

22.6 ± 4.8

6.9

19.8

23.3

26.2

32.1

period

Apparent temperature (°C)

23.6 ± 6.8

4.3

19.2

24.5

29.0

37.7

 

Relative humidity (%)

60.5 ± 18.1

10

48

63

74

95

 

Barometric pressure (hPa)

005.0 ± 59.5

989

1001

1005

1009

1023

 

PM2.5 (μg/m3) a

105.7 ± 66.8

9.9

53.6

98.4

138.2

436.7

 

UFP (number/cm3) a

23940 ± 9442

9024

16920

21890

29310

73010

Cold

Air temperature (°C)

3.4 ± 6.3

-9.1

-1.5

2.3

8.2

18.7

Period

Apparent temperature (°C)

2.9 ± 5.5

-8.0

-1.3

1.9

6.4

18.1

 

Relative humidity (%)

47.8 ± 20.8

12 31

46

63

96

 
 

Barometric pressure (hPa)

1021.0 ± 65.4

999

1016

1021

1025

1037

 

PM2.5 (μg/m3) a

122.0 ± 94.6

13.9

47.5

90.3

184.4

413.4

 

UFP (number/cm3) a

30940 ± 10637

13460

24120

29150

35550

76280

  1. a. Particulate air pollution data were available only for the period from March 2004 on.
  2. PM2.5: particulate matter (PM) with an aerodynamic diameter <2.5 μm.
  3. UFP: ultrafine particles, particles with an aerodynamic diameter <0.1 μm.