SmogRank / Mexico / México

Air quality in Ciudad Nezahualcoyotl

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

25.0µg/m³
Moderate

Latest hour (17:00 UTC), 1.7× the WHO 24-hour guideline. 24-hour average 18.1 µg/m³.

Rank among 666 cities

24 hours#30of 666, at 18.1 µg/m³
7 days#418of 2,330, at 11.1 µg/m³
30 days#190of 2,324, at 18.0 µg/m³
This year#210of 2,173, at 22.1 µg/m³

Why it ranks here

Cleaner than usual. The last 7 days averaged 11.1 µg/m³, well below its typical 23.3; rain or wind often clears the air for a while.
Seasonal. Over the past year its worst months were January, averaging up to 38.7 µg/m³ against 16.3 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Ciudad Nezahualcoyotl's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

The last 12 months, day by day

1102031Oct 2025NovDecJan 2026FebMarAprMayJunJulAugSep2025-10-01: no data2025-10-02: no data2025-10-03: no data2025-10-04: no data2025-10-05: no data2025-10-06: no data2025-10-07: no data2025-10-08: no data2025-10-09: no data2025-10-10: no data2025-10-11: no data2025-10-12: no data2025-10-13: no data2025-10-14: no data2025-10-15: 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: 26.5 µg/m³2025-11-01: 34.2 µg/m³2025-11-02: 28.4 µg/m³2025-11-03: 16.3 µg/m³2025-11-04: 26.9 µg/m³2025-11-05: 34.0 µg/m³2025-11-06: 19.8 µg/m³2025-11-07: 30.9 µg/m³2025-11-08: 43.6 µg/m³2025-11-09: 24.4 µg/m³2025-11-10: 9.9 µg/m³2025-11-11: 18.9 µg/m³2025-11-12: 35.0 µg/m³2025-11-13: 24.8 µg/m³2025-11-14: 30.4 µg/m³2025-11-15: 33.5 µg/m³2025-11-16: 37.1 µg/m³2025-11-17: 34.0 µg/m³2025-11-18: 41.0 µg/m³2025-11-19: 25.8 µg/m³2025-11-20: 35.2 µg/m³2025-11-21: 40.8 µg/m³2025-11-22: 34.9 µg/m³2025-11-23: 30.8 µg/m³2025-11-24: 27.5 µg/m³2025-11-25: 30.6 µg/m³2025-11-26: 36.5 µg/m³2025-11-27: 13.2 µg/m³2025-11-28: 10.2 µg/m³2025-11-29: 29.0 µg/m³2025-11-30: 37.7 µg/m³2025-12-01: 28.4 µg/m³2025-12-02: 33.3 µg/m³2025-12-03: 29.1 µg/m³2025-12-04: 36.3 µg/m³2025-12-05: 30.0 µg/m³2025-12-06: 32.0 µg/m³2025-12-07: 36.0 µg/m³2025-12-08: 16.7 µg/m³2025-12-09: 24.9 µg/m³2025-12-10: 28.9 µg/m³2025-12-11: 24.1 µg/m³2025-12-12: 39.6 µg/m³2025-12-13: 34.3 µg/m³2025-12-14: 17.9 µg/m³2025-12-15: 7.5 µg/m³2025-12-16: 22.1 µg/m³2025-12-17: 31.0 µg/m³2025-12-18: 35.1 µg/m³2025-12-19: 38.8 µg/m³2025-12-20: 39.6 µg/m³2025-12-21: 34.2 µg/m³2025-12-22: 30.5 µg/m³2025-12-23: 25.8 µg/m³2025-12-24: 35.8 µg/m³2025-12-25: 51.7 µg/m³2025-12-26: 33.2 µg/m³2025-12-27: 35.9 µg/m³2025-12-28: 31.3 µg/m³2025-12-29: 24.2 µg/m³2025-12-30: 9.8 µg/m³2025-12-31: 32.8 µg/m³2026-01-01: 132.0 µg/m³2026-01-02: no data2026-01-03: 38.8 µg/m³2026-01-04: 29.6 µg/m³2026-01-05: 45.3 µg/m³2026-01-06: 47.2 µg/m³2026-01-07: 37.6 µg/m³2026-01-08: 40.1 µg/m³2026-01-09: no data2026-01-10: no data2026-01-11: no data2026-01-12: no data2026-01-13: 24.9 µg/m³2026-01-14: 26.5 µg/m³2026-01-15: 22.6 µg/m³2026-01-16: 38.4 µg/m³2026-01-17: 28.8 µg/m³2026-01-18: 25.1 µg/m³2026-01-19: 37.5 µg/m³2026-01-20: 37.6 µg/m³2026-01-21: 32.6 µg/m³2026-01-22: 30.9 µg/m³2026-01-23: 21.8 µg/m³2026-01-24: no data2026-01-25: no data2026-01-26: no data2026-01-27: no data2026-01-28: no data2026-01-29: no data2026-01-30: no data2026-01-31: no data2026-02-01: no data2026-02-02: no data2026-02-03: no data2026-02-04: no data2026-02-05: no data2026-02-06: no data2026-02-07: no data2026-02-08: no data2026-02-09: no data2026-02-10: no data2026-02-11: no data2026-02-12: no data2026-02-13: no data2026-02-14: no data2026-02-15: no data2026-02-16: no data2026-02-17: no data2026-02-18: no data2026-02-19: no data2026-02-20: no data2026-02-21: no data2026-02-22: no data2026-02-23: no data2026-02-24: 20.4 µg/m³2026-02-25: no data2026-02-26: no data2026-02-27: no data2026-02-28: no data2026-03-01: no data2026-03-02: no data2026-03-03: no data2026-03-04: no data2026-03-05: no data2026-03-06: no data2026-03-07: no data2026-03-08: no data2026-03-09: no data2026-03-10: no data2026-03-11: no data2026-03-12: no data2026-03-13: no data2026-03-14: 22.7 µg/m³2026-03-15: 21.7 µg/m³2026-03-16: 26.4 µg/m³2026-03-17: 17.8 µg/m³2026-03-18: 23.7 µg/m³2026-03-19: 19.9 µg/m³2026-03-20: 16.8 µg/m³2026-03-21: 15.0 µg/m³2026-03-22: 19.2 µg/m³2026-03-23: 22.2 µg/m³2026-03-24: 23.9 µg/m³2026-03-25: 22.5 µg/m³2026-03-26: 18.2 µg/m³2026-03-27: 16.2 µg/m³2026-03-28: 10.3 µg/m³2026-03-29: 13.0 µg/m³2026-03-30: 18.3 µg/m³2026-03-31: 11.5 µg/m³2026-04-01: 22.0 µg/m³2026-04-02: 26.5 µg/m³2026-04-03: 20.7 µg/m³2026-04-04: 18.3 µg/m³2026-04-05: 14.7 µg/m³2026-04-06: 12.8 µg/m³2026-04-07: 25.5 µg/m³2026-04-08: 22.7 µg/m³2026-04-09: 16.0 µg/m³2026-04-10: 22.9 µg/m³2026-04-11: 27.5 µg/m³2026-04-12: 23.1 µg/m³2026-04-13: 19.7 µg/m³2026-04-14: 15.9 µg/m³2026-04-15: 18.6 µg/m³2026-04-16: 22.6 µg/m³2026-04-17: 25.0 µg/m³2026-04-18: 30.2 µg/m³2026-04-19: 14.9 µg/m³2026-04-20: 18.5 µg/m³2026-04-21: 22.0 µg/m³2026-04-22: 23.8 µg/m³2026-04-23: 24.3 µg/m³2026-04-24: 28.7 µg/m³2026-04-25: 29.5 µg/m³2026-04-26: 19.5 µg/m³2026-04-27: 23.8 µg/m³2026-04-28: 22.0 µg/m³2026-04-29: no data2026-04-30: no data2026-05-01: no data2026-05-02: no data2026-05-03: no data2026-05-04: no data2026-05-05: 30.0 µg/m³2026-05-06: no data2026-05-07: 29.2 µg/m³2026-05-08: 26.6 µg/m³2026-05-09: 23.2 µg/m³2026-05-10: 27.2 µg/m³2026-05-11: 28.8 µg/m³2026-05-12: 22.8 µg/m³2026-05-13: 37.5 µg/m³2026-05-14: 18.3 µg/m³2026-05-15: 27.7 µg/m³2026-05-16: 26.2 µg/m³2026-05-17: 27.3 µg/m³2026-05-18: 25.6 µg/m³2026-05-19: 26.8 µg/m³2026-05-20: 21.0 µg/m³2026-05-21: 25.3 µg/m³2026-05-22: 33.0 µg/m³2026-05-23: 24.8 µg/m³2026-05-24: 25.5 µg/m³2026-05-25: 22.5 µg/m³2026-05-26: 21.7 µg/m³2026-05-27: 24.3 µg/m³2026-05-28: 15.5 µg/m³2026-05-29: 18.1 µg/m³2026-05-30: 25.1 µg/m³2026-05-31: 28.3 µg/m³2026-06-01: 22.0 µg/m³2026-06-02: 23.5 µg/m³2026-06-03: 21.3 µg/m³2026-06-04: 11.8 µg/m³2026-06-05: 29.6 µg/m³2026-06-06: 16.7 µg/m³2026-06-07: 13.6 µg/m³2026-06-08: 17.3 µg/m³2026-06-09: 15.3 µg/m³2026-06-10: 11.7 µg/m³2026-06-11: 16.4 µg/m³2026-06-12: 12.7 µg/m³2026-06-13: 20.9 µg/m³2026-06-14: 10.9 µg/m³2026-06-15: no data2026-06-16: no data2026-06-17: no data2026-06-18: no data2026-06-19: no data2026-06-20: 5.3 µg/m³2026-06-21: 5.8 µg/m³2026-06-22: 16.0 µg/m³2026-06-23: 17.8 µg/m³2026-06-24: 10.8 µg/m³2026-06-25: 12.4 µg/m³2026-06-26: 17.6 µg/m³2026-06-27: 18.6 µg/m³2026-06-28: no data2026-06-29: no data2026-06-30: 26.0 µg/m³2026-07-01: 47.5 µg/m³2026-07-02: 29.3 µg/m³2026-07-03: 25.0 µg/m³2026-07-04: 31.5 µg/m³2026-07-05: 35.5 µg/m³2026-07-06: 36.2 µg/m³2026-07-07: 18.1 µg/m³2026-07-08: 16.4 µg/m³2026-07-09: 10.3 µg/m³2026-07-10: 23.1 µg/m³2026-07-11: 16.7 µg/m³2026-07-12: 10.7 µg/m³2026-07-13: 18.0 µg/m³2026-07-14: 19.1 µg/m³2026-07-15: 23.8 µg/m³2026-07-16: 15.0 µg/m³2026-07-17: 15.3 µg/m³2026-07-18: 19.9 µg/m³2026-07-19: 24.2 µg/m³2026-07-20: 23.3 µg/m³2026-07-21: 23.0 µg/m³2026-07-22: 19.7 µg/m³2026-07-23: 23.4 µg/m³2026-07-24: 21.1 µg/m³2026-07-25: 15.8 µg/m³2026-07-26: 15.4 µg/m³2026-07-27: 21.5 µg/m³2026-07-28: 19.9 µg/m³2026-07-29: 8.4 µg/m³2026-07-30: 21.5 µg/m³2026-07-31: 14.5 µg/m³2026-08-01: 21.0 µg/m³2026-08-02: 18.0 µg/m³2026-08-03: 19.8 µg/m³2026-08-04: 23.7 µg/m³2026-08-05: 30.0 µg/m³2026-08-06: 19.7 µg/m³2026-08-07: 17.1 µg/m³2026-08-08: 21.1 µg/m³2026-08-09: 22.1 µg/m³2026-08-10: 20.0 µg/m³2026-08-11: 20.2 µg/m³2026-08-12: 17.7 µg/m³2026-08-13: 15.7 µg/m³2026-08-14: 25.3 µg/m³2026-08-15: 22.6 µg/m³2026-08-16: 8.5 µg/m³2026-08-17: 13.6 µg/m³2026-08-18: 15.6 µg/m³2026-08-19: 20.9 µg/m³2026-08-20: 28.0 µg/m³2026-08-21: 27.5 µg/m³2026-08-22: 22.5 µg/m³2026-08-23: 28.7 µg/m³2026-08-24: 13.3 µg/m³2026-08-25: 24.2 µg/m³2026-08-26: 25.1 µg/m³2026-08-27: 23.3 µg/m³2026-08-28: 25.5 µg/m³2026-08-29: 16.6 µg/m³2026-08-30: 25.4 µg/m³2026-08-31: 17.6 µg/m³2026-09-01: 13.9 µg/m³2026-09-02: 25.4 µg/m³2026-09-03: 23.7 µg/m³2026-09-04: 22.8 µg/m³2026-09-05: 14.2 µg/m³2026-09-06: 16.5 µg/m³2026-09-07: 16.2 µg/m³2026-09-08: 28.3 µg/m³2026-09-09: 17.6 µg/m³2026-09-10: 26.0 µg/m³2026-09-11: 26.2 µg/m³2026-09-12: 30.0 µg/m³2026-09-13: 27.2 µg/m³2026-09-14: 21.2 µg/m³2026-09-15: 29.9 µg/m³2026-09-16: 32.7 µg/m³2026-09-17: 7.2 µg/m³2026-09-18: 8.9 µg/m³2026-09-19: 11.3 µg/m³2026-09-20: 16.2 µg/m³2026-09-21: 14.1 µg/m³2026-09-22: 17.1 µg/m³2026-09-23: 15.2 µg/m³2026-09-24: 21.0 µg/m³2026-09-25: 11.9 µg/m³2026-09-26: 8.4 µg/m³2026-09-27: 11.5 µg/m³2026-09-28: 12.7 µg/m³2026-09-29: 5.7 µg/m³2026-09-30: 6.2 µg/m³
227 of 268 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

15302026-09-30 23:00 UTC: 6.5 µg/m³2026-10-01 00:00 UTC: 14.0 µg/m³2026-10-01 01:00 UTC: 15.0 µg/m³2026-10-01 02:00 UTC: 21.0 µg/m³2026-10-01 03:00 UTC: 19.0 µg/m³2026-10-01 04:00 UTC: 16.0 µg/m³2026-10-01 05:00 UTC: 20.0 µg/m³2026-10-01 06:00 UTC: 21.0 µg/m³2026-10-01 07:00 UTC: 20.0 µg/m³2026-10-01 08:00 UTC: 22.0 µg/m³2026-10-01 09:00 UTC: 20.0 µg/m³2026-10-01 10:00 UTC: 12.0 µg/m³2026-10-01 11:00 UTC: 18.0 µg/m³2026-10-01 12:00 UTC: 21.0 µg/m³2026-10-01 13:00 UTC: 22.0 µg/m³2026-10-01 14:00 UTC: 15.5 µg/m³2026-10-01 15:00 UTC: 17.5 µg/m³2026-10-01 16:00 UTC: 19.0 µg/m³2026-10-01 17:00 UTC: 25.0 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#1596NovDecJanFebMarAprMayJunJulAugSep
Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 26.5 µg/m³Jan 2026: 38.7 µg/m³JanFeb 2025: 24.5 µg/m³FebMar 2025: 29.3 µg/m³Mar 2026: 18.9 µg/m³MarApr 2025: 30.0 µg/m³Apr 2026: 21.8 µg/m³AprMay 2025: 24.4 µg/m³May 2026: 25.5 µg/m³MayJun 2025: 15.3 µg/m³Jun 2026: 16.3 µg/m³JunJul 2026: 21.4 µg/m³JulAug 2026: 21.0 µg/m³AugSep 2026: 18.0 µg/m³SepOctNov 2025: 29.2 µg/m³NovDec 2025: 30.0 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

Monitors

StationOperatorType
NezahualcóyotlMexico SINAICA Terms and ConditionsSinaica MexicoReference
Santiago AcahualtepecMexico 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 18:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.