Detailed overview of ambient air pollution valuis from individual stations

Year: 2001
Pollutant:NOx-nitrogen oxides(oxides of nitrogen)
Station: 774 - Pha4-Libus
Code:CZ04CMLIB
Institution:Czech Hydrometeorological Institute
Region:Prague
District:Praha 4
IHd: 100
Measure method:chemiluminescence
Unit:ug/m^3

Average daily concentrations

Day/
Month

12345678910111213141516171819202122232425262728293031XMaxN
1 39 28 35 89 34 17 25 64 38 63 ~ 71 107 74 159 107 30 126 ~ ~ ~ 29 35 39 ~ 37 28 40 86 59 45 57.75 158.86 26.00
2 38 31 43 27 18 21 49 61 43 48 24 37 49 63 67 109 51 26 34 23 26 22 34 59 41 42 49 45 ~ ~ ~ 42.09 108.90 28.00
3 37 43 53 23 39 38 43 44 38 23 18 32 26 27 48 55 41 30 22 28 51 96 75 31 27 22 23 31 36 69 40 38.97 96.05 31.00
4 40 45 47 51 19 21 21 29 34 40 37 20 15 15 14 26 33 22 36 29 20 23 37 35 29 26 28 16 28 31 ~ 28.86 51.07 30.00
5 35 33 38 47 29 16 22 34 40 32 25 16 19 19 22 27 22 22 18 36 34 33 26 44 30 25 25 31 39 22 25 28.62 47.37 31.00
6 16 12 8.95 17 27 30 30 28 21 20 21 30 35 43 22 20 27 23 19 29 31 29 14 25 31 37 27 35 33 24 ~ 25.48 43.13 30.00
7 27 28 25 23 20 19 27 39 33 22 26 28 25 26 25 33 27 20 32 39 25 30 29 42 29 30 33 27 33 33 23 28.38 41.50 31.00
8 30 35 23 21 30 20 31 26 29 31 21 17 36 31 29 31 25 40 33 36 29 36 39 32 28 24 35 24 39 32 31 29.84 40.11 31.00
9 28 18 30 31 37 33 26 20 11 23 19 23 21 24 19 22 36 34 35 26 22 22 25 49 45 54 28 32 35 27 ~ 28.45 54.04 30.00
10 29 33 44 39 62 58 58 74 43 43 45 52 51 73 62 110 51 65 67 34 27 42 53 46 41 34 20 26 36 30 32 47.76 110.00 31.00
11 19 47 47 32 49 28 26 19 36 54 44 53 59 76 57 76 53 27 66 88 62 30 25 45 64 223 129 39 49 44 ~ 55.56 222.58 30.00
12 22 22 36 61 62 101 43 47 76 82 137 38 48 82 87 36 75 65 54 41 27 28 36 21 13 23 26 18 30 18 25 47.64 137.13 31.00

Quarterly and annual absolute and relative frequency of average daily concentrations
partial and total air pollution indexes according to classes of IHd multiples

Quarter

concentration classes in IHd multiples

total ind.

part of it in IHd multiples

max.
date

<=1/3 <=2/3 <=1.0 <=1.5 <=2.0 <=3.0 <=4.0 > 1/32/31.01.52.0 3.04.0

concentration classes in measurement units

part of above IHd multiples in meas. units

0- 33 34- 67 68- 100 101- 150 151- 200 201- 300 301- 400 over 400 33 67 100 150 200 300 400
ABS. 29 44 7 4 1 0 0 0 85 56 12 5 1 0 0 0 159
REL. 34.1 51.7 8.2 4.7 1.1 0.0 0.0 0.0 100.0 65.9 14.1 5.9 1.2 0.0 0.0 0.015.1
ID 34 51 8 9 5 0 0 0 109
ABS. 67 24 0 0 0 0 0 0 91 24 0 0 0 0 0 0 51
REL. 73.6 26.3 0.0 0.0 0.0 0.0 0.0 0.0 100.0 26.4 0.0 0.0 0.0 0.0 0.0 0.0 4.4
ID 73 26 0 0 0 0 0 0 100
ABS. 72 20 0 0 0 0 0 0 92 20 0 0 0 0 0 0 54
REL. 78.2 21.7 0.0 0.0 0.0 0.0 0.0 0.0100.0 21.7 0.0 0.0 0.0 0.0 0.0 0.0 26.9
ID 78 21 0 0 0 0 0 0 100
ABS. 27 49 11 4 0 1 0 0 92 65 16 5 1 1 0 0 223
REL 29.3 53.2 11.9 4.3 0.0 1.0 0.0 0.0100.0 70.7 17.4 5.4 1.1 1.1 0.0 0.026.11
ID 29 53 11 8 0 27 0 0 130
Year
ABS. 195 137 18 8 1 1 0 0 360 165 28 10 2 1 0 0 223
REL. 54.1 38.0 5.0 2.2 0.2 0.2 0.0 0.0100.0 45.8 7.8 2.8 0.6 0.3 0.0 0.026.11
ID 54 38 5 4 1 6 0 0 110

Note:

1 frequency < 60 per quarter, or < 240 per annum
2 frequency < 30 per quarter, or < 120 per annum