SmogRank / Mexico / Coahuila

Air quality in Piedras Negras

Coahuila, Mexico. PM2.5 from 1 reference monitor, updated hourly.

No readings from Piedras Negras's monitors in the last two weeks. The history below shows what they measured before.

Rank

24 h
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not enough data
7 days
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not enough data
30 days
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not enough data
Year
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not enough data

Hour by hour

No hourly readings in the last few days. The chart returns when the monitors' data arrives.

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: no data2025-09-30: no data2025-10-01: 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: 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: no data2025-11-28: no data2025-11-29: no data2025-11-30: no data2025-12-01: no data2025-12-02: no data2025-12-03: no data2025-12-04: no data2025-12-05: no data2025-12-06: no data2025-12-07: no data2025-12-08: no data2025-12-09: no data2025-12-10: no data2025-12-11: no data2025-12-12: no data2025-12-13: no data2025-12-14: no data2025-12-15: no data2025-12-16: no data2025-12-17: no data2025-12-18: no data2025-12-19: no data2025-12-20: no data2025-12-21: no data2025-12-22: no data2025-12-23: no data2025-12-24: no data2025-12-25: no data2025-12-26: no data2025-12-27: no data2025-12-28: no data2025-12-29: no data2025-12-30: no data2025-12-31: no data2026-01-01: no data2026-01-02: no data2026-01-03: no data2026-01-04: no data2026-01-05: no data2026-01-06: no data2026-01-07: no data2026-01-08: no data2026-01-09: no data2026-01-10: no data2026-01-11: no data2026-01-12: no data2026-01-13: no data2026-01-14: no data2026-01-15: no data2026-01-16: no data2026-01-17: no data2026-01-18: no data2026-01-19: 20.8 µg/m³2026-01-20: no data2026-01-21: no data2026-01-22: no data2026-01-23: 15.4 µg/m³2026-01-24: 5.3 µg/m³2026-01-25: no data2026-01-26: no data2026-01-27: 13.5 µg/m³2026-01-28: 24.1 µg/m³2026-01-29: 68.7 µg/m³2026-01-30: no data2026-01-31: 21.5 µg/m³2026-02-01: no data2026-02-02: no data2026-02-03: no data2026-02-04: 7.0 µg/m³2026-02-05: 10.2 µg/m³2026-02-06: no data2026-02-07: 442.0 µg/m³2026-02-08: no data2026-02-09: 986.0 µg/m³2026-02-10: 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: 6.4 µg/m³2026-02-25: 13.4 µg/m³2026-02-26: 19.1 µg/m³2026-02-27: 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: 9.3 µg/m³2026-03-07: no data2026-03-08: 4.2 µg/m³2026-03-09: 6.1 µg/m³2026-03-10: 13.2 µg/m³2026-03-11: no data2026-03-12: no data2026-03-13: 3.9 µg/m³2026-03-14: no data2026-03-15: 10.4 µg/m³2026-03-16: no data2026-03-17: no data2026-03-18: no data2026-03-19: no data2026-03-20: no data2026-03-21: no data2026-03-22: 2.8 µg/m³2026-03-23: no data2026-03-24: no data2026-03-25: 9.2 µg/m³2026-03-26: 10.2 µg/m³2026-03-27: no data2026-03-28: no data2026-03-29: 5.7 µg/m³2026-03-30: 6.6 µg/m³2026-03-31: no data2026-04-01: no data2026-04-02: 9.3 µg/m³2026-04-03: no data2026-04-04: no data2026-04-05: no data2026-04-06: no data2026-04-07: no data2026-04-08: no data2026-04-09: no data2026-04-10: no data2026-04-11: no data2026-04-12: 5.2 µg/m³2026-04-13: no data2026-04-14: no data2026-04-15: 10.3 µg/m³2026-04-16: 11.2 µg/m³2026-04-17: no data2026-04-18: no data2026-04-19: no data2026-04-20: no data2026-04-21: 986.0 µg/m³2026-04-22: no data2026-04-23: no data2026-04-24: no data2026-04-25: no data2026-04-26: 986.0 µg/m³2026-04-27: no data2026-04-28: no data2026-04-29: 986.0 µg/m³2026-04-30: no data2026-05-01: 986.0 µg/m³2026-05-02: no data2026-05-03: 986.0 µg/m³2026-05-04: 986.0 µg/m³2026-05-05: no data2026-05-06: no data2026-05-07: 986.0 µg/m³2026-05-08: no data2026-05-09: 986.0 µg/m³2026-05-10: 986.0 µg/m³2026-05-11: no data2026-05-12: no data2026-05-13: 986.0 µg/m³2026-05-14: no data2026-05-15: no data2026-05-16: no data2026-05-17: no data2026-05-18: no data2026-05-19: no data2026-05-20: no data2026-05-21: no data2026-05-22: no data2026-05-23: no data2026-05-24: no data2026-05-25: no data2026-05-26: no data2026-05-27: no data2026-05-28: no data2026-05-29: no data2026-05-30: no data2026-05-31: no data2026-06-01: no data2026-06-02: no data2026-06-03: no data2026-06-04: no data2026-06-05: no data2026-06-06: no data2026-06-07: no data2026-06-08: 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: no data2026-06-20: no data2026-06-21: no data2026-06-22: no data2026-06-23: no data2026-06-24: no data2026-06-25: no data2026-06-26: no data2026-06-27: no data2026-06-28: no data2026-06-29: no data2026-06-30: no data2026-07-01: no data2026-07-02: no data2026-07-03: no data2026-07-04: no data2026-07-05: no data2026-07-06: no data2026-07-07: no data2026-07-08: no data2026-07-09: no data2026-07-10: no data2026-07-11: no data2026-07-12: no data2026-07-13: no data2026-07-14: no data2026-07-15: no data2026-07-16: no data2026-07-17: no data2026-07-18: no data2026-07-19: no data2026-07-20: no data2026-07-21: no data2026-07-22: no data2026-07-23: no data2026-07-24: no data2026-07-25: no data2026-07-26: no data2026-07-27: no data2026-07-28: no data2026-07-29: no data2026-07-30: no data2026-07-31: no data2026-08-01: no data2026-08-02: no data2026-08-03: no data2026-08-04: no data2026-08-05: no data2026-08-06: no data2026-08-07: no data2026-08-08: no data2026-08-09: no data2026-08-10: no data2026-08-11: no data2026-08-12: no data2026-08-13: no data2026-08-14: no data2026-08-15: no data2026-08-16: no data2026-08-17: no data2026-08-18: no data2026-08-19: no data2026-08-20: no data2026-08-21: no data2026-08-22: no data2026-08-23: no data2026-08-24: no data2026-08-25: no data2026-08-26: no data2026-08-27: no data2026-08-28: no data2026-08-29: no data2026-08-30: no data2026-08-31: no data2026-09-01: no data2026-09-02: no data2026-09-03: no data2026-09-04: no data2026-09-05: no data2026-09-06: no data2026-09-07: no data2026-09-08: no data2026-09-09: no data2026-09-10: no data2026-09-11: no data2026-09-12: no data2026-09-13: no data2026-09-14: no data2026-09-15: no data2026-09-16: no data2026-09-17: no data2026-09-18: no data2026-09-19: no data2026-09-20: no data2026-09-21: no data2026-09-22: no data2026-09-23: no data2026-09-24: no data2026-09-25: no data2026-09-26: no data2026-09-27: no data2026-09-28: no data2026-09-29: no data2026-09-30: no data
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

18 of 39 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2195FebMarAprMay

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

2026 against 2025, month by month

15JanFebMar 2026: 7.4 µg/m³MarAprMayJunJulAugSepOctNovDec

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

Monitors

StationOperatorType
Centro de Rehabilitación DIFMexico 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

San Luis Potosí 31.7Tuxtla 29.1Hacienda Santa Fe 24.0San Salvador Tizatlalli 19.3Ciudad Nezahualcoyotl 18.0Naucalpan de Juárez 17.9Santa Anita 17.8Aguascalientes 17.8Guadalajara 17.5Saltillo 17.3Puebla 15.5Mexico City 14.9

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

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