SmogRank / Czechia / Central Bohemia

Air quality in Říčany

Central Bohemia, Czechia. PM2.5 from 3 low-cost sensors, updated hourly.

21.6 µg/m³
Moderate

Latest hour (09:00 UTC), 1.4× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#747
of 2,333 · 8.8 µg/m³
30 days
#2,148
of 2,331 · 3.9 µg/m³
Year
#306
of 2,173 · 15.7 µg/m³

Why it ranks here

Likely fire smoke. On Sep 28, when Říčany averaged 15.3 µg/m³ (its typical day: 11.5), NASA satellites detected 87 fires within 300 km (4 within 100 km). Smoke from those fires is a likely contributor; we don't check which way the wind blew, and mapped smoke can be high above the ground.

Seasonal. Over the past year its worst months were January, averaging up to 37.3 µg/m³ against 3.9 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Říčany's own measurements, with fire detections from NASA FIRMS and smoke maps from NOAA HMS; causes are the usual kinds for a pattern like this, not a confirmed source.

Last 4 days, hour by hour

15302026-10-01 00:00 UTC: 13.6 µg/m³2026-10-01 01:00 UTC: 14.5 µg/m³2026-10-01 02:00 UTC: 16.2 µg/m³2026-10-01 03:00 UTC: 17.2 µg/m³2026-10-01 04:00 UTC: 17.2 µg/m³2026-10-01 05:00 UTC: 18.5 µg/m³2026-10-01 06:00 UTC: 18.6 µg/m³2026-10-01 07:00 UTC: 19.2 µg/m³2026-10-01 08:00 UTC: 21.4 µg/m³2026-10-01 09:00 UTC: 21.6 µg/m³Sep 28Sep 29Sep 30Oct 1

Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 12.4 µg/m³2025-09-30: 13.1 µg/m³2025-10-01: 21.8 µg/m³2025-10-02: 21.5 µg/m³2025-10-03: 27.4 µg/m³2025-10-04: 19.8 µg/m³2025-10-05: 1.2 µg/m³2025-10-06: 1.7 µg/m³2025-10-07: 4.0 µg/m³2025-10-08: 15.6 µg/m³2025-10-09: 10.1 µg/m³2025-10-10: 7.1 µg/m³2025-10-11: 9.0 µg/m³2025-10-12: 9.9 µg/m³2025-10-13: 9.7 µg/m³2025-10-14: 14.7 µg/m³2025-10-15: no data2025-10-16: no data2025-10-17: no data2025-10-18: no data2025-10-19: no data2025-10-20: no data2025-10-21: no data2025-10-22: no data2025-10-23: no data2025-10-24: no data2025-10-25: no data2025-10-26: no data2025-10-27: no data2025-10-28: no data2025-10-29: no data2025-10-30: no data2025-10-31: no data2025-11-01: no data2025-11-02: no data2025-11-03: no data2025-11-04: no data2025-11-05: no data2025-11-06: no data2025-11-07: no data2025-11-08: no data2025-11-09: no data2025-11-10: no data2025-11-11: no data2025-11-12: no data2025-11-13: no data2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: no data2025-11-20: no data2025-11-21: no data2025-11-22: no data2025-11-23: no data2025-11-24: no data2025-11-25: no data2025-11-26: no data2025-11-27: 14.2 µg/m³2025-11-28: 30.5 µg/m³2025-11-29: 42.3 µg/m³2025-11-30: 21.2 µg/m³2025-12-01: 32.6 µg/m³2025-12-02: 16.7 µg/m³2025-12-03: 22.5 µg/m³2025-12-04: 34.9 µg/m³2025-12-05: 25.2 µg/m³2025-12-06: 21.7 µg/m³2025-12-07: 16.7 µg/m³2025-12-08: 4.0 µg/m³2025-12-09: 10.2 µg/m³2025-12-10: 11.5 µg/m³2025-12-11: 13.8 µg/m³2025-12-12: 21.6 µg/m³2025-12-13: 16.2 µg/m³2025-12-14: 11.6 µg/m³2025-12-15: 13.6 µg/m³2025-12-16: 15.1 µg/m³2025-12-17: 32.2 µg/m³2025-12-18: 36.5 µg/m³2025-12-19: 40.5 µg/m³2025-12-20: 30.8 µg/m³2025-12-21: 35.2 µg/m³2025-12-22: 20.3 µg/m³2025-12-23: 15.4 µg/m³2025-12-24: 16.3 µg/m³2025-12-25: 33.8 µg/m³2025-12-26: 58.4 µg/m³2025-12-27: no data2025-12-28: no data2025-12-29: 18.3 µg/m³2025-12-30: 4.0 µg/m³2025-12-31: 4.5 µg/m³2026-01-01: 9.9 µg/m³2026-01-02: 2.9 µg/m³2026-01-03: 3.0 µg/m³2026-01-04: no data2026-01-05: 18.9 µg/m³2026-01-06: 40.2 µg/m³2026-01-07: 35.4 µg/m³2026-01-08: 44.1 µg/m³2026-01-09: 41.6 µg/m³2026-01-10: 39.0 µg/m³2026-01-11: 7.8 µg/m³2026-01-12: 33.5 µg/m³2026-01-13: 65.4 µg/m³2026-01-14: 30.9 µg/m³2026-01-15: 53.7 µg/m³2026-01-16: 42.7 µg/m³2026-01-17: 39.9 µg/m³2026-01-18: 17.1 µg/m³2026-01-19: 23.3 µg/m³2026-01-20: 38.6 µg/m³2026-01-21: 49.9 µg/m³2026-01-22: 52.6 µg/m³2026-01-23: 42.8 µg/m³2026-01-24: 63.4 µg/m³2026-01-25: 73.9 µg/m³2026-01-26: 21.8 µg/m³2026-01-27: 28.0 µg/m³2026-01-28: 53.1 µg/m³2026-01-29: 46.8 µg/m³2026-01-30: 50.2 µg/m³2026-01-31: 48.4 µg/m³2026-02-01: 57.6 µg/m³2026-02-02: 58.3 µg/m³2026-02-03: 41.1 µg/m³2026-02-04: 40.0 µg/m³2026-02-05: 43.3 µg/m³2026-02-06: 34.5 µg/m³2026-02-07: 33.7 µg/m³2026-02-08: 38.4 µg/m³2026-02-09: 44.0 µg/m³2026-02-10: 35.0 µg/m³2026-02-11: 16.6 µg/m³2026-02-12: 1.8 µg/m³2026-02-13: 5.2 µg/m³2026-02-14: 20.5 µg/m³2026-02-15: 12.8 µg/m³2026-02-16: 27.7 µg/m³2026-02-17: 23.4 µg/m³2026-02-18: 10.2 µg/m³2026-02-19: 37.3 µg/m³2026-02-20: 41.5 µg/m³2026-02-21: 16.6 µg/m³2026-02-22: 2.4 µg/m³2026-02-23: 1.0 µg/m³2026-02-24: 8.5 µg/m³2026-02-25: 22.8 µg/m³2026-02-26: 35.6 µg/m³2026-02-27: 46.3 µg/m³2026-02-28: 47.7 µg/m³2026-03-01: 29.5 µg/m³2026-03-02: 33.2 µg/m³2026-03-03: 34.5 µg/m³2026-03-04: 54.5 µg/m³2026-03-05: 60.1 µg/m³2026-03-06: 46.9 µg/m³2026-03-07: 44.7 µg/m³2026-03-08: 40.8 µg/m³2026-03-09: 36.0 µg/m³2026-03-10: 31.9 µg/m³2026-03-11: 26.4 µg/m³2026-03-12: 13.7 µg/m³2026-03-13: 11.2 µg/m³2026-03-14: 19.4 µg/m³2026-03-15: 11.7 µg/m³2026-03-16: 16.2 µg/m³2026-03-17: 15.0 µg/m³2026-03-18: 40.3 µg/m³2026-03-19: 44.9 µg/m³2026-03-20: 46.2 µg/m³2026-03-21: 39.4 µg/m³2026-03-22: 35.5 µg/m³2026-03-23: 28.0 µg/m³2026-03-24: 36.1 µg/m³2026-03-25: 22.3 µg/m³2026-03-26: 4.3 µg/m³2026-03-27: 3.4 µg/m³2026-03-28: 12.0 µg/m³2026-03-29: 12.3 µg/m³2026-03-30: 6.4 µg/m³2026-03-31: 4.0 µg/m³2026-04-01: 9.1 µg/m³2026-04-02: 20.3 µg/m³2026-04-03: 28.4 µg/m³2026-04-04: 5.7 µg/m³2026-04-05: 3.2 µg/m³2026-04-06: 0.5 µg/m³2026-04-07: 1.0 µg/m³2026-04-08: 5.7 µg/m³2026-04-09: 8.2 µg/m³2026-04-10: 26.7 µg/m³2026-04-11: 36.2 µg/m³2026-04-12: 42.4 µg/m³2026-04-13: 25.4 µg/m³2026-04-14: 25.4 µg/m³2026-04-15: 36.8 µg/m³2026-04-16: 33.0 µg/m³2026-04-17: 17.5 µg/m³2026-04-18: 20.4 µg/m³2026-04-19: 13.3 µg/m³2026-04-20: 1.8 µg/m³2026-04-21: 13.3 µg/m³2026-04-22: 10.1 µg/m³2026-04-23: 4.3 µg/m³2026-04-24: 11.5 µg/m³2026-04-25: 13.7 µg/m³2026-04-26: 6.1 µg/m³2026-04-27: 2.7 µg/m³2026-04-28: 2.7 µg/m³2026-04-29: 1.6 µg/m³2026-04-30: 6.6 µg/m³2026-05-01: 20.8 µg/m³2026-05-02: 8.3 µg/m³2026-05-03: 1.4 µg/m³2026-05-04: 7.2 µg/m³2026-05-05: 13.8 µg/m³2026-05-06: 5.3 µg/m³2026-05-07: 1.7 µg/m³2026-05-08: 9.8 µg/m³2026-05-09: 23.1 µg/m³2026-05-10: 15.2 µg/m³2026-05-11: 6.3 µg/m³2026-05-12: 4.0 µg/m³2026-05-13: 3.2 µg/m³2026-05-14: 2.1 µg/m³2026-05-15: 4.2 µg/m³2026-05-16: 10.6 µg/m³2026-05-17: 9.6 µg/m³2026-05-18: 6.0 µg/m³2026-05-19: 7.0 µg/m³2026-05-20: 0.9 µg/m³2026-05-21: 3.6 µg/m³2026-05-22: 7.8 µg/m³2026-05-23: 13.3 µg/m³2026-05-24: 20.3 µg/m³2026-05-25: 8.1 µg/m³2026-05-26: 2.5 µg/m³2026-05-27: 3.7 µg/m³2026-05-28: 0.0 µg/m³2026-05-29: 1.4 µg/m³2026-05-30: 3.1 µg/m³2026-05-31: 5.3 µg/m³2026-06-01: 8.3 µg/m³2026-06-02: 8.0 µg/m³2026-06-03: 4.3 µg/m³2026-06-04: 0.3 µg/m³2026-06-05: 0.5 µg/m³2026-06-06: 1.2 µg/m³2026-06-07: 0.3 µg/m³2026-06-08: 0.8 µg/m³2026-06-09: 2.2 µg/m³2026-06-10: 2.2 µg/m³2026-06-11: 2.4 µg/m³2026-06-12: 0.3 µg/m³2026-06-13: 0.8 µg/m³2026-06-14: 2.6 µg/m³2026-06-15: 1.2 µg/m³2026-06-16: 2.9 µg/m³2026-06-17: 11.7 µg/m³2026-06-18: 11.2 µg/m³2026-06-19: 12.5 µg/m³2026-06-20: 16.4 µg/m³2026-06-21: 21.1 µg/m³2026-06-22: 16.9 µg/m³2026-06-23: 6.4 µg/m³2026-06-24: 5.4 µg/m³2026-06-25: 14.6 µg/m³2026-06-26: 25.9 µg/m³2026-06-27: 29.4 µg/m³2026-06-28: 22.6 µg/m³2026-06-29: 24.8 µg/m³2026-06-30: 30.0 µg/m³2026-07-01: 18.0 µg/m³2026-07-02: 10.6 µg/m³2026-07-03: 0.9 µg/m³2026-07-04: 2.2 µg/m³2026-07-05: 2.6 µg/m³2026-07-06: 1.9 µg/m³2026-07-07: 0.2 µg/m³2026-07-08: 1.9 µg/m³2026-07-09: 0.2 µg/m³2026-07-10: 3.1 µg/m³2026-07-11: 2.1 µg/m³2026-07-12: 4.7 µg/m³2026-07-13: 13.1 µg/m³2026-07-14: 15.3 µg/m³2026-07-15: 18.9 µg/m³2026-07-16: 17.2 µg/m³2026-07-17: 12.4 µg/m³2026-07-18: 10.4 µg/m³2026-07-19: 12.8 µg/m³2026-07-20: 0.4 µg/m³2026-07-21: 1.1 µg/m³2026-07-22: 0.8 µg/m³2026-07-23: 2.3 µg/m³2026-07-24: 4.6 µg/m³2026-07-25: 4.8 µg/m³2026-07-26: 6.8 µg/m³2026-07-27: 1.8 µg/m³2026-07-28: 8.3 µg/m³2026-07-29: 6.8 µg/m³2026-07-30: 12.0 µg/m³2026-07-31: 23.3 µg/m³2026-08-01: 21.6 µg/m³2026-08-02: 10.5 µg/m³2026-08-03: 16.5 µg/m³2026-08-04: 20.4 µg/m³2026-08-05: 14.5 µg/m³2026-08-06: 8.4 µg/m³2026-08-07: 1.8 µg/m³2026-08-08: 1.2 µg/m³2026-08-09: 4.3 µg/m³2026-08-10: 5.2 µg/m³2026-08-11: 2.7 µg/m³2026-08-12: 0.9 µg/m³2026-08-13: 0.9 µg/m³2026-08-14: 1.6 µg/m³2026-08-15: 1.8 µg/m³2026-08-16: 6.6 µg/m³2026-08-17: 16.6 µg/m³2026-08-18: 5.3 µg/m³2026-08-19: 7.7 µg/m³2026-08-20: 1.0 µg/m³2026-08-21: 4.0 µg/m³2026-08-22: 0.6 µg/m³2026-08-23: 0.7 µg/m³2026-08-24: 1.6 µg/m³2026-08-25: 3.3 µg/m³2026-08-26: 7.9 µg/m³2026-08-27: 12.4 µg/m³2026-08-28: 12.4 µg/m³2026-08-29: 0.3 µg/m³2026-08-30: 1.1 µg/m³2026-08-31: 0.3 µg/m³2026-09-01: 0.0 µg/m³2026-09-02: 0.2 µg/m³2026-09-03: 0.9 µg/m³2026-09-04: 0.2 µg/m³2026-09-05: 0.5 µg/m³2026-09-06: 0.8 µg/m³2026-09-07: 2.4 µg/m³2026-09-08: 1.6 µg/m³2026-09-09: 2.2 µg/m³2026-09-10: 1.9 µg/m³2026-09-11: 6.1 µg/m³2026-09-12: 5.5 µg/m³2026-09-13: 6.8 µg/m³2026-09-14: 7.1 µg/m³2026-09-15: 4.7 µg/m³2026-09-16: 4.2 µg/m³2026-09-17: 1.0 µg/m³2026-09-18: 2.2 µg/m³2026-09-19: 0.5 µg/m³2026-09-20: 0.6 µg/m³2026-09-21: 0.4 µg/m³2026-09-22: 0.8 µg/m³2026-09-23: 5.2 µg/m³2026-09-24: 2.6 µg/m³2026-09-25: 4.1 µg/m³2026-09-26: 10.2 µg/m³2026-09-27: 10.8 µg/m³2026-09-28: 15.3 µg/m³2026-09-29: 9.6 µg/m³2026-09-30: 8.7 µg/m³
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

130 of 319 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2419OctNovDecJanFebMarAprMayJunJulAugSep

Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2026: 37.3 µg/m³JanFeb 2026: 28.7 µg/m³FebMar 2026: 27.8 µg/m³MarApr 2025: 13.4 µg/m³Apr 2026: 14.5 µg/m³AprMay 2025: 10.6 µg/m³May 2026: 7.4 µg/m³MayJun 2025: 9.1 µg/m³Jun 2026: 9.6 µg/m³JunJul 2025: 7.8 µg/m³Jul 2026: 7.1 µg/m³JulAug 2025: 8.9 µg/m³Aug 2026: 6.3 µg/m³AugSep 2025: 7.5 µg/m³Sep 2026: 3.9 µg/m³SepOct 2025: 12.4 µg/m³OctNovDec 2025: 21.9 µg/m³Dec

Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 8.8 µg/m³8.820252025: 12.2 µg/m³12.2

Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
BechoviceCC BY 4.0AirGradientLow-cost
VestecCC BY 4.0Vestec MeteoLow-cost
HradesinCC BY 4.0AirGradientLow-cost

No reference monitor here, so the value is the median of low-cost sensors (at least two reporting each hour). Low-cost sensors can read high in humid air. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in Czechia

Stodůlky 4.0

30-day averages, µg/m³. All of Czechia →

Updated 2026-10-01 10:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.