Information about air quality in the Czech Republic

SWRS - support table for announcement and cancellation of smog situations and regulations

Information on currently issued smog situations/regulations/alerts can be found here here

Updated: 2022-07-05 13:04 UTC

PM10 SO2 NO2 ►O3◄

SWRS areas for O₃
►Agglomeration of Prague◄ Central Bohemia region South Bohemia region Plzeň region Karlovy Vary region Ústí nad Labem region Liberec region Hradec Králové region Pardubice region Vysočina region South Moravia region without agglomeration of Brno Agglomeration of Brno Olomouc region Zlín region Moravia and Silezia zone Agglomeration of Ostrava/Karviná/Frýdek-Místek
Situation No situation No situation No situation No situation No situation No situation No situation No situation No situation No situation No situation No situation No situation No situation No situation No situation
Warning No problem No problem No problem No problem No problem No problem No problem No problem No problem No problem No problem No problem No problem No problem No problem No problem

O₃(ozone) - Agglomeration of Prague

   
Station Announcement Cancellation h:
Code Name Owner Increasing trends - only informative** conc. > 180 conc. > 240 Decreasing trends - only informative*** conc. < 180 conc. < 240  
 
ASUCA Praha 6-Suchdol CHMI - - - - > 48 hrs > 48 hrs
ALIBA Praha 4-Libus CHMI - - - - > 48 hrs > 48 hrs
AKOBA Praha 8-Kobylisy CHMI - - - - > 48 hrs > 48 hrs
ASTOA Praha 5-Stodulky CHMI - - - - > 48 hrs > 48 hrs
ARIEA Praha 2-Riegrovy sady CHMI - - - - > 48 hrs > 48 hrs
Number of stations 0/5 0/5 0/5 0/5 5/5 5/5
1h averages of O3. The time is in UTC and corresponds to the end of the interval over which the concentration is averaged.
0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23 -24 -25 -26 -27 -28 -29 -30 -31 -32 -33 -34 -35 -36 -37 -38 -39 -40 -41 -42 -43 -44 -45 -46 -47 -48 -49  
05.07. 13:00 05.07. 12:00 05.07. 11:00 05.07. 10:00 05.07. 09:00 05.07. 08:00 05.07. 07:00 05.07. 06:00 05.07. 05:00 05.07. 04:00 05.07. 03:00 05.07. 02:00 05.07. 01:00 05.07. 00:00 04.07. 23:00 04.07. 22:00 04.07. 21:00 04.07. 20:00 04.07. 19:00 04.07. 18:00 04.07. 17:00 04.07. 16:00 04.07. 15:00 04.07. 14:00 04.07. 13:00 04.07. 12:00 04.07. 11:00 04.07. 10:00 04.07. 09:00 04.07. 08:00 04.07. 07:00 04.07. 06:00 04.07. 05:00 04.07. 04:00 04.07. 03:00 04.07. 02:00 04.07. 01:00 04.07. 00:00 03.07. 23:00 03.07. 22:00 03.07. 21:00 03.07. 20:00 03.07. 19:00 03.07. 18:00 03.07. 17:00 03.07. 16:00 03.07. 15:00 03.07. 14:00 03.07. 13:00 03.07. 12:00  
 
    109.9 109.9 ↗ 99.4 99.4 ↗ 94.0 94.0 ↗ 84.2 84.2 ↗ 73.6 73.6 ↗ 61.4 61.4 ↗ 58.5 58.5 ↗ 56.3 56.3 ↗ 54.3 54.3 ↘ 55.9 55.9 ↗ 50.5 50.5 ↘ 61.6 61.6 ↘ 65.0 65.0 ↘ 77.8 77.8 ↘ 80.0 80.0 ↘ 92.4 92.4 ↘ 100.7 100.7 ↘ 103.9 103.9 ↘ 126.9 126.9 ↘ 131.7 131.7 ↘ 135.3 135.3 ↗ 123.9 123.9 ↗ 116.3 116.3 ↗ 106.7 106.7 ↗ 100.5 100.5 ↗ 90.6 90.6 ↗ 88.6 88.6 ↗ 81.8 81.8 ↗ 58.1 58.1 ↗ 46.3 46.3 ↘ 48.1 48.1 ↗ 34.7 34.7 ↘ 46.5 46.5 ↘ 49.3 49.3 ↗ 25.1 25.1 ↗ 20.5 20.5 ↘ 34.1 34.1 ↘ 49.7 49.7 ↘ 69.8 69.8 ↘ 80.6 80.6 ↘ 89.0 89.0 ↘ 96.4 96.4 ↘ 106.9 106.9 ↘ 108.3 108.3 ↗ 104.5 104.5 ↗ 100.5 100.5 → 100.1 100.1 ↘ 101.3 101.3 ↗ 98.6 98.6 →
    108.7 108.7 ↗ 100.1 100.1 ↗ 95.8 95.8 ↗ 81.8 81.8 ↗ 64.4 64.4 ↗ 52.1 52.1 ↗ 46.1 46.1 ↘ 54.7 54.7 ↘ 57.3 57.3 ↘ 64.4 64.4 →     77.2 77.2 ↘ 93.4 93.4 ↘ 107.7 107.7 ↗ 92.2 92.2 ↘ 97.8 97.8 ↘ 99.9 99.9 ↘ 119.1 119.1 ↘ 120.3 120.3 ↘ 121.5 121.5 ↘ 133.7 133.7 → 133.9 133.9 ↗ 127.5 127.5 ↗ 109.7 109.7 ↘ 111.7 111.7 ↗ 99.4 99.4 ↗ 75.0 75.0 ↗ 52.7 52.7 ↗ 35.3 35.3 ↗ 23.5 23.5 ↗ 22.1 22.1 ↗ 18.8 18.8 ↘ 22.7 22.7 ↘ 30.7 30.7 →     54.9 54.9 ↘ 61.2 61.2 ↘ 74.2 74.2 ↗ 66.6 66.6 → 66.0 66.0 ↘ 68.0 68.0 ↘ 79.4 79.4 ↘ 96.0 96.0 ↘ 108.9 108.9 ↗ 107.5 107.5 ↗ 101.5 101.5 → 100.7 100.7 ↗ 98.0 98.0 ↗ 94.2 94.2 →
    107.5 107.5 ↗ 100.5 100.5 ↗ 93.6 93.6 ↗ 81.2 81.2 ↗ 67.0 67.0 ↗ 58.9 58.9 ↗ 56.5 56.5 ↗ 55.1 55.1 ↘ 56.5 56.5 →     73.4 73.4 → 72.8 72.8 ↘ 78.0 78.0 ↘ 93.8 93.8 ↗ 84.8 84.8 ↘ 92.8 92.8 ↘ 99.8 99.8 ↘ 104.3 104.3 ↘ 133.5 133.5 ↘ 140.4 140.4 ↗ 136.9 136.9 ↗ 126.1 126.1 ↗ 119.9 119.9 ↗ 107.3 107.3 ↗ 105.3 105.3 ↗ 92.8 92.8 → 92.2 92.2 ↗ 88.0 88.0 ↗ 63.8 63.8 ↗ 55.3 55.3 ↗ 46.3 46.3 ↘ 65.4 65.4 ↗ 53.7 53.7 →     42.9 42.9 ↘ 56.5 56.5 ↘ 58.5 58.5 ↘ 67.0 67.0 ↘ 80.2 80.2 ↘ 86.2 86.2 ↘ 91.8 91.8 ↘ 95.8 95.8 ↘ 106.5 106.5 ↘ 110.1 110.1 ↗ 106.5 106.5 → 106.7 106.7 ↗ 102.7 102.7 → 102.7 102.7 ↗ 99.8 99.8 →
    113.9 113.9 ↗ 103.7 103.7 ↗ 98.6 98.6 ↗ 87.8 87.8 ↗ 75.0 75.0 ↗ 67.2 67.2 ↗ 63.8 63.8 → 64.2 64.2 ↗ 60.2 60.2 → 60.2 60.2 ↗ 58.5 58.5 ↘ 68.0 68.0 →     97.0 97.0 ↗ 89.2 89.2 ↘ 98.2 98.2 ↘ 103.1 103.1 ↘ 109.7 109.7 ↘ 127.3 127.3 ↗ 123.1 123.1 ↘ 127.1 127.1 ↗ 124.1 124.1 → 123.5 123.5 ↗ 116.1 116.1 ↗ 103.7 103.7 ↗ 99.6 99.6 ↗ 94.8 94.8 ↗ 86.6 86.6 ↗ 73.8 73.8 ↗ 54.7 54.7 ↗ 53.3 53.3 ↗ 43.7 43.7 ↘ 54.7 54.7 ↗ 52.7 52.7 ↘ 60.0 60.0 ↗ 48.3 48.3 →     40.7 40.7 ↗ 35.3 35.3 ↘ 53.3 53.3 ↘ 75.6 75.6 ↘ 90.2 90.2 ↘ 101.1 101.1 ↘ 108.1 108.1 ↗ 106.5 106.5 ↗ 101.3 101.3 ↗ 98.8 98.8 ↗ 97.6 97.6 ↗ 95.4 95.4 →
    102.5 102.5 ↗ 99.4 99.4 ↗ 92.0 92.0 ↗ 78.2 78.2 ↗ 60.6 60.6 ↗ 54.1 54.1 ↗ 52.1 52.1 ↗ 50.7 50.7 ↗ 45.3 45.3 →     58.3 58.3 ↘ 61.0 61.0 ↘ 63.8 63.8 ↘ 96.4 96.4 ↗ 80.2 80.2 ↘ 95.8 95.8 ↘ 99.0 99.0 ↘ 108.9 108.9 ↘ 131.1 131.1 ↗ 129.9 129.9 ↘ 135.9 135.9 ↗ 129.3 129.3 ↗ 114.5 114.5 ↗ 105.1 105.1 ↗ 97.8 97.8 ↗ 95.6 95.6 ↗ 88.0 88.0 ↗ 77.4 77.4 ↗ 51.3 51.3 ↗ 38.3 38.3 ↗ 21.3 21.3 ↘ 22.9 22.9 ↘ 30.1 30.1 →     45.5 45.5 ↘ 47.5 47.5 ↘ 49.9 49.9 ↘ 51.1 51.1 ↘ 58.9 58.9 ↘ 70.8 70.8 ↘ 80.2 80.2 ↘ 90.8 90.8 ↘ 101.3 101.3 ↘ 108.1 108.1 ↗ 102.5 102.5 ↗ 101.3 101.3 → 100.3 100.3 ↘ 101.7 101.7 ↗ 97.4 97.4 →


  • * Announcement of smog situation (regulation) is to be assessed if not issued yet. For more info see detailed legend (in Czech only).
  • ** Number of consecutive hours with increasing trends of1h average of. Counted since1h average exceeded 140µg/m³. For more info see detailed legend (in Czech only)
  • *** Number of consecutive hours with decreasing trends of 1h average of O₃. Counted only if 1h average exceeded value 140µg/m³. before the first decreasing trend occurred. For more info see detailed legend (in Czech only).

Legend

   Color    Description
Exceedance of information threshold 180 µg/m³
Exceedance of warning threshold 240 µg/m³
No exceedance
Missing data


Notes

Smog situation for given region is announced in case when on at least one measurement station representative for given region 1-hour average O3 concentration exceeds information threshold value 180 µg.m⁻³.

Alert for public is announced for given area in case when on at least one measurement station representative for given region 1-hour average O3 concentration exceeds alert threshold value 240 µg.m⁻³.

Cancellation of regulation, smog situation

  • Alert / smog situation and is revoked if no measuring site representative for the given region reports the concentration of polluting substances above the corresponding threshold value and this state lasts continuously for at least 12 hours and no recurrent instance of exceeding the respective threshold value can be expected within the next 24 hours based on the meteorological forecast.
  • 12-hour time interval is being reduced up to 3 hours in a case when meteorological conditions cannot be assessed as leading to the smog situation and recurrent instance of exceeding the respective threshold value can almost be excluded in the next 24 hours in accordance with the meteorological forecast.