SmogRank / Mexico / Querétaro

Air quality in San Juan del Río

Querétaro, Mexico. PM2.5 from 2 reference monitors, updated hourly.

0.0µg/m³
Good

Latest hour (19:00 UTC), 0.0× the WHO 24-hour guideline.

Rank, worst first

24 hours–not enough data
7 days#822of 2,314, at 8.3 µg/m³
30 days#359of 2,322, at 10.8 µg/m³
This year#350of 2,173, at 14.4 µg/m³

The last 12 months, day by day

1102031Oct 2025NovDecJan 2026FebMarAprMayJunJulAugSep2025-10-01: 12.1 µg/m³2025-10-02: 9.7 µg/m³2025-10-03: 5.9 µg/m³2025-10-04: 10.3 µg/m³2025-10-05: 12.8 µg/m³2025-10-06: 12.8 µg/m³2025-10-07: 10.8 µg/m³2025-10-08: 3.7 µg/m³2025-10-09: 3.1 µg/m³2025-10-10: 2.4 µg/m³2025-10-11: 2.0 µg/m³2025-10-12: 9.8 µg/m³2025-10-13: 6.3 µg/m³2025-10-14: 8.0 µg/m³2025-10-15: 6.4 µg/m³2025-10-16: 12.7 µg/m³2025-10-17: 13.8 µg/m³2025-10-18: 15.3 µg/m³2025-10-19: 7.8 µg/m³2025-10-20: 14.2 µg/m³2025-10-21: 13.6 µg/m³2025-10-22: 13.1 µg/m³2025-10-23: 6.3 µg/m³2025-10-24: 10.2 µg/m³2025-10-25: 11.7 µg/m³2025-10-26: 12.5 µg/m³2025-10-27: 12.1 µg/m³2025-10-28: 12.0 µg/m³2025-10-29: 11.5 µg/m³2025-10-30: 8.5 µg/m³2025-10-31: 13.7 µg/m³2025-11-01: 17.4 µg/m³2025-11-02: 13.4 µg/m³2025-11-03: 7.2 µg/m³2025-11-04: 10.4 µg/m³2025-11-05: 10.1 µg/m³2025-11-06: 7.1 µg/m³2025-11-07: 13.5 µg/m³2025-11-08: 14.8 µg/m³2025-11-09: 9.6 µg/m³2025-11-10: 5.6 µg/m³2025-11-11: 7.5 µg/m³2025-11-12: 10.4 µg/m³2025-11-13: 9.1 µg/m³2025-11-14: 10.6 µg/m³2025-11-15: 12.5 µg/m³2025-11-16: 12.1 µg/m³2025-11-17: 16.5 µg/m³2025-11-18: 18.1 µg/m³2025-11-19: 16.6 µg/m³2025-11-20: 22.4 µg/m³2025-11-21: 25.2 µg/m³2025-11-22: 20.8 µg/m³2025-11-23: 15.8 µg/m³2025-11-24: 22.7 µg/m³2025-11-25: 23.4 µg/m³2025-11-26: 11.7 µg/m³2025-11-27: 8.2 µg/m³2025-11-28: 3.7 µg/m³2025-11-29: 15.6 µg/m³2025-11-30: 20.8 µg/m³2025-12-01: 18.9 µg/m³2025-12-02: 20.2 µg/m³2025-12-03: 19.0 µg/m³2025-12-04: 14.5 µg/m³2025-12-05: 15.9 µg/m³2025-12-06: 16.0 µg/m³2025-12-07: 11.3 µg/m³2025-12-08: 8.0 µg/m³2025-12-09: 9.7 µg/m³2025-12-10: 12.6 µg/m³2025-12-11: 11.3 µg/m³2025-12-12: 17.6 µg/m³2025-12-13: 16.7 µg/m³2025-12-14: 13.6 µg/m³2025-12-15: 3.2 µg/m³2025-12-16: 14.1 µg/m³2025-12-17: 18.0 µg/m³2025-12-18: 20.0 µg/m³2025-12-19: 12.5 µg/m³2025-12-20: 21.9 µg/m³2025-12-21: 13.5 µg/m³2025-12-22: 11.4 µg/m³2025-12-23: 5.8 µg/m³2025-12-24: 7.8 µg/m³2025-12-25: 11.1 µg/m³2025-12-26: 9.6 µg/m³2025-12-27: 15.3 µg/m³2025-12-28: 15.0 µg/m³2025-12-29: 13.5 µg/m³2025-12-30: 5.7 µg/m³2025-12-31: 12.7 µg/m³2026-01-01: 33.0 µg/m³2026-01-02: 16.3 µg/m³2026-01-03: 19.8 µg/m³2026-01-04: 14.7 µg/m³2026-01-05: 30.7 µg/m³2026-01-06: 26.4 µg/m³2026-01-07: 25.7 µg/m³2026-01-08: 28.2 µg/m³2026-01-09: 26.2 µg/m³2026-01-10: 20.8 µg/m³2026-01-11: 6.1 µg/m³2026-01-12: 17.5 µg/m³2026-01-13: 15.6 µg/m³2026-01-14: 20.9 µg/m³2026-01-15: 9.0 µg/m³2026-01-16: 14.6 µg/m³2026-01-17: 15.2 µg/m³2026-01-18: 9.7 µg/m³2026-01-19: 13.0 µg/m³2026-01-20: 12.2 µg/m³2026-01-21: 10.5 µg/m³2026-01-22: 14.8 µg/m³2026-01-23: 9.7 µg/m³2026-01-24: 8.1 µg/m³2026-01-25: 8.2 µg/m³2026-01-26: 10.4 µg/m³2026-01-27: 11.7 µg/m³2026-01-28: 15.2 µg/m³2026-01-29: 17.8 µg/m³2026-01-30: 15.1 µg/m³2026-01-31: 9.4 µg/m³2026-02-01: 12.7 µg/m³2026-02-02: 14.8 µg/m³2026-02-03: 17.7 µg/m³2026-02-04: 17.7 µg/m³2026-02-05: 7.5 µg/m³2026-02-06: 12.5 µg/m³2026-02-07: 11.2 µg/m³2026-02-08: 13.0 µg/m³2026-02-09: 13.6 µg/m³2026-02-10: 24.7 µg/m³2026-02-11: 27.8 µg/m³2026-02-12: 19.7 µg/m³2026-02-13: 17.9 µg/m³2026-02-14: 24.4 µg/m³2026-02-15: 24.2 µg/m³2026-02-16: 22.5 µg/m³2026-02-17: 24.3 µg/m³2026-02-18: 22.6 µg/m³2026-02-19: 28.3 µg/m³2026-02-20: 18.3 µg/m³2026-02-21: 26.9 µg/m³2026-02-22: 12.8 µg/m³2026-02-23: 9.9 µg/m³2026-02-24: 9.7 µg/m³2026-02-25: 16.9 µg/m³2026-02-26: 19.2 µg/m³2026-02-27: 16.0 µg/m³2026-02-28: 13.7 µg/m³2026-03-01: 15.9 µg/m³2026-03-02: 12.7 µg/m³2026-03-03: 15.4 µg/m³2026-03-04: 17.3 µg/m³2026-03-05: 22.3 µg/m³2026-03-06: 20.2 µg/m³2026-03-07: 20.5 µg/m³2026-03-08: 27.0 µg/m³2026-03-09: 24.2 µg/m³2026-03-10: 19.7 µg/m³2026-03-11: 20.1 µg/m³2026-03-12: 12.3 µg/m³2026-03-13: 16.1 µg/m³2026-03-14: 16.7 µg/m³2026-03-15: 15.9 µg/m³2026-03-16: 18.6 µg/m³2026-03-17: 13.7 µg/m³2026-03-18: 16.7 µg/m³2026-03-19: 15.2 µg/m³2026-03-20: 12.8 µg/m³2026-03-21: 9.4 µg/m³2026-03-22: 11.2 µg/m³2026-03-23: 14.9 µg/m³2026-03-24: 16.4 µg/m³2026-03-25: 15.6 µg/m³2026-03-26: 13.6 µg/m³2026-03-27: 12.9 µg/m³2026-03-28: 11.5 µg/m³2026-03-29: 9.0 µg/m³2026-03-30: 13.0 µg/m³2026-03-31: 8.0 µg/m³2026-04-01: 11.4 µg/m³2026-04-02: 15.6 µg/m³2026-04-03: 13.7 µg/m³2026-04-04: 12.6 µg/m³2026-04-05: 14.6 µg/m³2026-04-06: 8.1 µg/m³2026-04-07: 9.2 µg/m³2026-04-08: 13.4 µg/m³2026-04-09: 16.3 µg/m³2026-04-10: 16.7 µg/m³2026-04-11: no data2026-04-12: no data2026-04-13: no data2026-04-14: 10.3 µg/m³2026-04-15: 15.0 µg/m³2026-04-16: no data2026-04-17: no data2026-04-18: no data2026-04-19: no data2026-04-20: no data2026-04-21: no data2026-04-22: no data2026-04-23: no data2026-04-24: no data2026-04-25: no data2026-04-26: no data2026-04-27: no data2026-04-28: 12.7 µg/m³2026-04-29: 16.9 µg/m³2026-04-30: 17.1 µg/m³2026-05-01: 21.6 µg/m³2026-05-02: 23.7 µg/m³2026-05-03: 11.3 µg/m³2026-05-04: 16.2 µg/m³2026-05-05: 20.1 µg/m³2026-05-06: 18.3 µg/m³2026-05-07: 18.6 µg/m³2026-05-08: 22.1 µg/m³2026-05-09: 21.2 µg/m³2026-05-10: 19.9 µg/m³2026-05-11: 11.8 µg/m³2026-05-12: 9.8 µg/m³2026-05-13: 12.2 µg/m³2026-05-14: no data2026-05-15: no data2026-05-16: 15.2 µg/m³2026-05-17: no data2026-05-18: 21.1 µg/m³2026-05-19: 21.4 µg/m³2026-05-20: 11.9 µg/m³2026-05-21: 12.0 µg/m³2026-05-22: 13.8 µg/m³2026-05-23: 19.6 µg/m³2026-05-24: 16.4 µg/m³2026-05-25: 15.4 µg/m³2026-05-26: 13.0 µg/m³2026-05-27: 14.7 µg/m³2026-05-28: 9.2 µg/m³2026-05-29: 11.4 µg/m³2026-05-30: 12.4 µg/m³2026-05-31: 13.8 µg/m³2026-06-01: 10.6 µg/m³2026-06-02: 14.4 µg/m³2026-06-03: 17.8 µg/m³2026-06-04: 13.2 µg/m³2026-06-05: 7.5 µg/m³2026-06-06: 8.3 µg/m³2026-06-07: 11.7 µg/m³2026-06-08: no data2026-06-09: no data2026-06-10: no data2026-06-11: no data2026-06-12: no data2026-06-13: no data2026-06-14: no data2026-06-15: no data2026-06-16: no data2026-06-17: no data2026-06-18: no data2026-06-19: 11.0 µg/m³2026-06-20: 8.2 µg/m³2026-06-21: 12.6 µg/m³2026-06-22: 13.5 µg/m³2026-06-23: 14.6 µg/m³2026-06-24: 3.9 µg/m³2026-06-25: 6.3 µg/m³2026-06-26: 11.7 µg/m³2026-06-27: 11.6 µg/m³2026-06-28: 10.9 µg/m³2026-06-29: 12.6 µg/m³2026-06-30: 19.1 µg/m³2026-07-01: 15.1 µg/m³2026-07-02: 14.0 µg/m³2026-07-03: 12.5 µg/m³2026-07-04: 14.9 µg/m³2026-07-05: 13.4 µg/m³2026-07-06: 10.5 µg/m³2026-07-07: 9.2 µg/m³2026-07-08: no data2026-07-09: 8.7 µg/m³2026-07-10: 12.5 µg/m³2026-07-11: 12.2 µg/m³2026-07-12: 6.4 µg/m³2026-07-13: 7.6 µg/m³2026-07-14: 13.2 µg/m³2026-07-15: 16.1 µg/m³2026-07-16: 9.4 µg/m³2026-07-17: 7.6 µg/m³2026-07-18: 15.5 µg/m³2026-07-19: 19.9 µg/m³2026-07-20: 20.6 µg/m³2026-07-21: 19.1 µg/m³2026-07-22: 13.4 µg/m³2026-07-23: 14.9 µg/m³2026-07-24: 15.2 µg/m³2026-07-25: 14.8 µg/m³2026-07-26: 10.3 µg/m³2026-07-27: 13.8 µg/m³2026-07-28: 14.8 µg/m³2026-07-29: 14.4 µg/m³2026-07-30: 16.1 µg/m³2026-07-31: 18.5 µg/m³2026-08-01: 10.8 µg/m³2026-08-02: 16.9 µg/m³2026-08-03: 15.2 µg/m³2026-08-04: 15.6 µg/m³2026-08-05: 15.4 µg/m³2026-08-06: no data2026-08-07: no data2026-08-08: no data2026-08-09: no data2026-08-10: no data2026-08-11: no data2026-08-12: 13.5 µg/m³2026-08-13: 16.7 µg/m³2026-08-14: 14.4 µg/m³2026-08-15: 15.2 µg/m³2026-08-16: 9.7 µg/m³2026-08-17: 9.0 µg/m³2026-08-18: 11.3 µg/m³2026-08-19: 9.8 µg/m³2026-08-20: 10.9 µg/m³2026-08-21: 14.1 µg/m³2026-08-22: 8.9 µg/m³2026-08-23: 9.3 µg/m³2026-08-24: 6.6 µg/m³2026-08-25: 9.0 µg/m³2026-08-26: 11.9 µg/m³2026-08-27: 10.1 µg/m³2026-08-28: 8.9 µg/m³2026-08-29: 12.5 µg/m³2026-08-30: 16.4 µg/m³2026-08-31: 15.1 µg/m³2026-09-01: 19.3 µg/m³2026-09-02: 12.4 µg/m³2026-09-03: 12.1 µg/m³2026-09-04: 11.2 µg/m³2026-09-05: 16.8 µg/m³2026-09-06: 12.3 µg/m³2026-09-07: 10.3 µg/m³2026-09-08: 12.5 µg/m³2026-09-09: 5.8 µg/m³2026-09-10: 13.3 µg/m³2026-09-11: 13.8 µg/m³2026-09-12: 11.4 µg/m³2026-09-13: 10.7 µg/m³2026-09-14: 8.5 µg/m³2026-09-15: 13.3 µg/m³2026-09-16: 17.1 µg/m³2026-09-17: 7.6 µg/m³2026-09-18: 4.8 µg/m³2026-09-19: 6.9 µg/m³2026-09-20: 8.5 µg/m³2026-09-21: 11.3 µg/m³2026-09-22: 12.3 µg/m³2026-09-23: 8.0 µg/m³2026-09-24: no data2026-09-25: no data2026-09-26: 4.2 µg/m³2026-09-27: 6.3 µg/m³2026-09-28: 9.8 µg/m³2026-09-29: 11.5 µg/m³2026-09-30: 9.6 µg/m³
117 of 327 measured days were over the WHO 24-hour guideline (15 µg/m³). One row per month, one square per local day.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Last 4 days, hour by hour

15302026-10-01 00:00 UTC: 2.2 µg/m³2026-10-01 01:00 UTC: 3.0 µg/m³2026-10-01 02:00 UTC: 4.2 µg/m³2026-10-01 06:00 UTC: 0.2 µg/m³2026-10-01 07:00 UTC: 6.3 µg/m³2026-10-01 08:00 UTC: 11.6 µg/m³2026-10-01 09:00 UTC: 8.5 µg/m³2026-10-01 10:00 UTC: 8.6 µg/m³2026-10-01 11:00 UTC: 6.7 µg/m³2026-10-01 12:00 UTC: 7.1 µg/m³2026-10-01 13:00 UTC: 7.5 µg/m³2026-10-01 14:00 UTC: 2.1 µg/m³2026-10-01 15:00 UTC: 10.4 µg/m³2026-10-01 16:00 UTC: 9.5 µg/m³2026-10-01 17:00 UTC: 2.0 µg/m³2026-10-01 18:00 UTC: 0.0 µg/m³2026-10-01 19:00 UTC: 0.0 µg/m³Sep 28Sep 29Sep 30Oct 1
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Its world rank, day by day

#1#2301OctNovDecJanFebMarAprMayJunJulAugSep
Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2026: 16.3 µg/m³JanFeb 2026: 17.9 µg/m³FebMar 2025: 21.1 µg/m³Mar 2026: 15.8 µg/m³MarApr 2025: 19.2 µg/m³Apr 2026: 13.6 µg/m³AprMay 2025: 19.7 µg/m³May 2026: 16.0 µg/m³MayJun 2025: 9.4 µg/m³Jun 2026: 11.6 µg/m³JunJul 2025: 11.6 µg/m³Jul 2026: 13.5 µg/m³JulAug 2025: 10.3 µg/m³Aug 2026: 12.3 µg/m³AugSep 2025: 8.1 µg/m³Sep 2026: 10.8 µg/m³SepOct 2025: 9.8 µg/m³OctNov 2025: 13.8 µg/m³NovDec 2025: 13.4 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 8.3 µg/m³8.320252025: 8.9 µg/m³8.92024no data20232023: 6.9 µg/m³6.9
Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
San Juan del RíoMexico SINAICA Terms and ConditionsSinaica MexicoReference
San Juan del RíoMexico SINAICA Terms and ConditionsSinaica MexicoReference

The city's value is the median of its reference monitors each hour; low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in Mexico

30-day averages, µg/m³. All of Mexico.

Updated 2026-10-01 20:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.