Detailed overview of ambient air pollution valuis from individual stations

Year: 1999
Pollutant:NOx-nitrogen oxides(oxides of nitrogen)
Station: 774 - Pha4-Libus
Code:CZ04CMLIB
Institution:Czech Hydrometeorological Institute
Region:Hlavni mesto Praha
District:Praha 4
IHd: 100
Measure method:chemiluminescence
Unit:ug/m^3

Average daily concentrations

Day/
Month

12345678910111213141516171819202122232425262728293031XMaxN
1 15 26 24 22 31 34 24 24 33 23 35 30 28 24 20 16 25 41 34 32 33 55 29 26 25 33 41 43 23 23 36 29.25 54.91 62.00
2 41 65 54 30 11 13 20 27 93 104 75 30 28 35 33 32 20 27 35 35 21 24 22 28 23 35 29 22 ~ ~ ~ 36.18 103.63 56.00
3 16 30 35 39 36 25 35 36 38 41 44 55 42 42 32 24 57 67 44 21 20 27 30 43 63 42 22 20 55 71 60 39.11 70.97 62.00
4 53 47 40 26 30 41 35 33 39 25 31 40 27 21 21 33 21 29 39 38 29 45 31 30 34 49 43 39 41 58 ~ 35.53 58.04 60.00
5 27 41 49 19 18 26 24 26 28 25 38 26 32 29 16 34 17 21 35 23 28 24 28 35 34 46 52 37 26 27 30 29.65 52.06 62.00
6 42 36 33 28 32 13 ~ 48 ~ 22 38 23 23 30 33 38 35 26 27 21 27 22 29 51 27 19 26 28 27 27 ~ 29.69 50.92 56.00
7 29 33 15 13 18 21 24 26 24 11 15 26 21 28 32 24 23 26 26 23 34 ~ 19 15 25 24 29 32 27 35 24 24.07 35.14 60.00
8 26 35 41 30 33 24 19 16 34 26 28 31 33 16 21 23 28 24 30 22 17 25 41 46 49 21 20 28 32 40 35 28.76 48.80 62.00
9 23 38 32 16 22 21 33 42 46 39 25 42 51 61 54 51 38 19 19 25 31 28 34 30 26 19 23 30 23 32 ~ 32.43 61.43 60.00
10 23 15 17 29 51 31 43 35 30 30 ~ 60 86 36 38 ~ ~ 56 37 31 35 39 34 33 54 43 40 44 65 66 28 40.42 85.79 56.00
11 47 43 71 69 121 37 27 60 66 37 49 58 44 29 74 48 48 42 88 71 80 46 68 87 52 83 28 34 33 44 ~ 56.13 121.35 60.00
12 32 24 18 16 21 21 20 23 21 31 17 14 23 24 41 34 25 25 26 46 65 86 90 20 14 11 25 39 39 30 30 30.65 89.62 62.00

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. 102 68 8 2 0 0 0 0 180 78 10 2 0 0 0 0 104
REL. 56.6 37.7 4.4 1.1 0.0 0.0 0.0 0.0 100.0 43.3 5.6 1.1 0.0 0.0 0.0 0.010.2
ID 56 37 4 2 0 0 0 0 101
ABS. 108 70 0 0 0 0 0 0 178 70 0 0 0 0 0 0 58
REL. 60.6 39.3 0.0 0.0 0.0 0.0 0.0 0.0 100.0 39.3 0.0 0.0 0.0 0.0 0.0 0.0 30.4
ID 60 39 0 0 0 0 0 0 100
ABS. 140 42 0 0 0 0 0 0 182 42 0 0 0 0 0 0 61
REL. 76.9 23.0 0.0 0.0 0.0 0.0 0.0 0.0100.0 23.1 0.0 0.0 0.0 0.0 0.0 0.0 14.9
ID 76 23 0 0 0 0 0 0 100
ABS. 74 78 24 2 0 0 0 0 178 104 26 2 0 0 0 0 121
REL 41.5 43.8 13.4 1.1 0.0 0.0 0.0 0.0100.0 58.4 14.6 1.1 0.0 0.0 0.0 0.0 5.11
ID 41 43 13 2 0 0 0 0 101
Year
ABS. 424 258 32 4 0 0 0 0 718 294 36 4 0 0 0 0 121
REL. 59.0 35.9 4.4 0.5 0.0 0.0 0.0 0.0100.0 40.9 5.0 0.6 0.0 0.0 0.0 0.0 5.11
ID 59 35 4 1 0 0 0 0 100

Note:

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