What is the air quality trend in Piedras Negras?

Over the past 8 days, Piedras Negras had an average AQI of 43 based on station measurements. The worst day was 2026-07-21 with AQI 54.

How is Piedras Negras air quality measured?

Air quality in Piedras Negras is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Piedras Negras, Mexico

Name: Piedras Negras Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Piedras Negras, Mexico.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

139h

PM2.5 Station

139h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	46	21–59	11.6 µg/m³	6h	2
2026-07-21	54	14–157	15.6 µg/m³	17h	2
2026-07-20	39	11–65	9.6 µg/m³	20h	2
2026-07-19	40	16–82	10.6 µg/m³	19h	2
2026-07-18	46	20–127	12.2 µg/m³	21h	2
2026-07-17	43	12–89	11.1 µg/m³	22h	2
2026-07-16	37	16–57	9.0 µg/m³	19h	2
2026-07-15	43	17–79	11.3 µg/m³	15h	2

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