SmogRank / Chile / Biobio

Air quality in Laja

No new readings from Laja's monitors since 30 Sept. Some networks publish days late. The figures below are from before then; they update when the data returns.

Biobio, Chile.

Mean for 30 Sept75US AQI
Moderate

PM2.5 22.1 µg/m³, 1.5× the WHO 24-hour guideline. The most recent day with readings.

About usual for late September (26.5 µg/m³).

Where Laja ranks

24 hours–not enough data
7 days–not enough data
30 days#127of 2,887, at 90 US AQI (30.3 µg/m³), 24 days to 30 Sept
This year#69of 2,735, at 115 US AQI (41.0 µg/m³), to 30 Sept

Why it ranks here

Seasonal. Over the past year its worst months were May, June, averaging up to 68.8 µg/m³ against 15.6 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

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

Bad-air episodes that reached Laja

Times when Laja and many cities around it had PM2.5 at twice their usual or more on the same days. Latest 8 of 9. All episodes.

The last 12 months, day by day

1102031Nov 2025DecJan 2026FebMarAprMayJunJulAugSepOct2025-11-01: no daily value, no readings from the monitor2025-11-02: no daily value, no readings from the monitor2025-11-03: no daily value, no readings from the monitor2025-11-04: no daily value, no readings from the monitor2025-11-05: no daily value, no readings from the monitor2025-11-06: no daily value, no readings from the monitor2025-11-07: no daily value, no readings from the monitor2025-11-08: no daily value, no readings from the monitor2025-11-09: no daily value, no readings from the monitor2025-11-10: no daily value, no readings from the monitor2025-11-11: no daily value, only 3 of the 18 hours a day needs2025-11-12: no daily value, only 14 of the 18 hours a day needs2025-11-13: 14.3 µg/m³2025-11-14: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-11-15: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-11-16: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-11-17: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-11-18: no daily value, only 15 of the 18 hours a day needs2025-11-19: no daily value, only 14 of the 18 hours a day needs2025-11-20: 14.1 µg/m³2025-11-21: 14.9 µg/m³2025-11-22: 17.6 µg/m³2025-11-23: 17.3 µg/m³2025-11-24: 19.0 µg/m³2025-11-25: no daily value, only 11 of the 18 hours a day needs2025-11-26: no daily value, only 14 of the 18 hours a day needs2025-11-27: 17.2 µg/m³2025-11-28: 17.3 µg/m³2025-11-29: 17.2 µg/m³2025-11-30: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-01: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-02: no daily value, only 14 of the 18 hours a day needs2025-12-03: no daily value, only 15 of the 18 hours a day needs2025-12-04: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-05: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-06: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-07: 18.5 µg/m³2025-12-08: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-09: no daily value, only 12 of the 18 hours a day needs2025-12-10: no daily value, only 15 of the 18 hours a day needs2025-12-11: 15.9 µg/m³2025-12-12: 14.8 µg/m³2025-12-13: 13.8 µg/m³2025-12-14: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-15: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-16: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-17: 14.8 µg/m³2025-12-18: 14.4 µg/m³2025-12-19: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-20: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-21: 13.1 µg/m³2025-12-22: 13.2 µg/m³2025-12-23: no daily value, only 13 of the 18 hours a day needs2025-12-24: no daily value, only 16 of the 18 hours a day needs2025-12-25: 15.0 µg/m³2025-12-26: 19.1 µg/m³2025-12-27: 14.6 µg/m³2025-12-28: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-29: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2025-12-30: 14.8 µg/m³2025-12-31: 14.4 µg/m³2026-01-01: 16.3 µg/m³2026-01-02: 16.7 µg/m³2026-01-03: 19.3 µg/m³2026-01-04: 19.6 µg/m³2026-01-05: 17.1 µg/m³2026-01-06: no daily value, only 17 of the 18 hours a day needs2026-01-07: no daily value, only 12 of the 18 hours a day needs2026-01-08: 19.6 µg/m³2026-01-09: 21.2 µg/m³2026-01-10: no daily value, only 11 of the 18 hours a day needs2026-01-11: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-01-12: 15.3 µg/m³2026-01-13: no daily value, only 15 of the 18 hours a day needs2026-01-14: no daily value, only 14 of the 18 hours a day needs2026-01-15: 16.0 µg/m³2026-01-16: 16.2 µg/m³2026-01-17: 16.1 µg/m³2026-01-18: 18.2 µg/m³2026-01-19: no daily value, no readings from the monitor2026-01-20: 49.5 µg/m³2026-01-21: 52.5 µg/m³2026-01-22: 30.0 µg/m³2026-01-23: 24.1 µg/m³2026-01-24: 21.0 µg/m³2026-01-25: 17.6 µg/m³2026-01-26: 16.5 µg/m³2026-01-27: no daily value, only 13 of the 18 hours a day needs2026-01-28: no daily value, only 16 of the 18 hours a day needs2026-01-29: 16.4 µg/m³2026-01-30: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-01-31: 15.6 µg/m³2026-02-01: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-02-02: 16.3 µg/m³2026-02-03: 14.3 µg/m³2026-02-04: 14.8 µg/m³2026-02-05: 14.5 µg/m³2026-02-06: 15.0 µg/m³2026-02-07: 15.2 µg/m³2026-02-08: 14.0 µg/m³2026-02-09: 13.5 µg/m³2026-02-10: no daily value, only 12 of the 18 hours a day needs2026-02-11: no daily value, only 15 of the 18 hours a day needs2026-02-12: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-02-13: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-02-14: 14.4 µg/m³2026-02-15: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-02-16: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-02-17: 13.4 µg/m³2026-02-18: 15.3 µg/m³2026-02-19: 14.4 µg/m³2026-02-20: 16.1 µg/m³2026-02-21: 19.5 µg/m³2026-02-22: 18.1 µg/m³2026-02-23: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-02-24: no daily value, only 12 of the 18 hours a day needs2026-02-25: no daily value, only 17 of the 18 hours a day needs2026-02-26: 19.3 µg/m³2026-02-27: 17.8 µg/m³2026-02-28: 14.3 µg/m³2026-03-01: 13.4 µg/m³2026-03-02: 13.5 µg/m³2026-03-03: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-03-04: 16.0 µg/m³2026-03-05: 17.1 µg/m³2026-03-06: 16.5 µg/m³2026-03-07: 16.5 µg/m³2026-03-08: 16.5 µg/m³2026-03-09: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-03-10: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-03-11: 17.6 µg/m³2026-03-12: 15.8 µg/m³2026-03-13: 16.0 µg/m³2026-03-14: 16.5 µg/m³2026-03-15: 13.8 µg/m³2026-03-16: 14.6 µg/m³2026-03-17: 16.1 µg/m³2026-03-18: 17.1 µg/m³2026-03-19: 15.3 µg/m³2026-03-20: 16.2 µg/m³2026-03-21: 20.3 µg/m³2026-03-22: no daily value, readings left out by our checks (a stuck monitor, error codes, or a reading its neighbours contradict)2026-03-23: no daily value, only 14 of the 18 hours a day needs2026-03-24: no daily value, no readings from the monitor2026-03-25: 21.5 µg/m³2026-03-26: 21.2 µg/m³2026-03-27: 25.0 µg/m³2026-03-28: 23.1 µg/m³2026-03-29: 21.8 µg/m³2026-03-30: 18.9 µg/m³2026-03-31: 17.0 µg/m³2026-04-01: 18.4 µg/m³2026-04-02: 21.5 µg/m³2026-04-03: 20.7 µg/m³2026-04-04: 20.4 µg/m³2026-04-05: 23.5 µg/m³2026-04-06: 29.3 µg/m³2026-04-07: no daily value, only 14 of the 18 hours a day needs2026-04-08: no daily value, only 13 of the 18 hours a day needs2026-04-09: 26.3 µg/m³2026-04-10: 29.3 µg/m³2026-04-11: 31.7 µg/m³2026-04-12: 36.0 µg/m³2026-04-13: 32.5 µg/m³2026-04-14: no daily value, only 12 of the 18 hours a day needs2026-04-15: no daily value, only 13 of the 18 hours a day needs2026-04-16: 25.8 µg/m³2026-04-17: 15.6 µg/m³2026-04-18: 21.1 µg/m³2026-04-19: 43.5 µg/m³2026-04-20: no daily value, only 11 of the 18 hours a day needs2026-04-21: no daily value, only 14 of the 18 hours a day needs2026-04-22: no daily value, only 15 of the 18 hours a day needs2026-04-23: 59.5 µg/m³2026-04-24: 51.8 µg/m³2026-04-25: 28.5 µg/m³2026-04-26: 54.6 µg/m³2026-04-27: 36.8 µg/m³2026-04-28: 42.8 µg/m³2026-04-29: 39.0 µg/m³2026-04-30: 34.3 µg/m³2026-05-01: 57.9 µg/m³2026-05-02: 86.5 µg/m³2026-05-03: 77.2 µg/m³2026-05-04: 70.9 µg/m³2026-05-05: no daily value, only 14 of the 18 hours a day needs2026-05-06: no daily value, only 15 of the 18 hours a day needs2026-05-07: 33.0 µg/m³2026-05-08: 30.8 µg/m³2026-05-09: 103.0 µg/m³2026-05-10: 55.4 µg/m³2026-05-11: 49.4 µg/m³2026-05-12: no daily value, only 13 of the 18 hours a day needs2026-05-13: no daily value, only 14 of the 18 hours a day needs2026-05-14: 56.5 µg/m³2026-05-15: 65.9 µg/m³2026-05-16: 36.0 µg/m³2026-05-17: 64.5 µg/m³2026-05-18: 65.5 µg/m³2026-05-19: 62.8 µg/m³2026-05-20: 77.5 µg/m³2026-05-21: 70.5 µg/m³2026-05-22: 71.2 µg/m³2026-05-23: 79.0 µg/m³2026-05-24: 76.2 µg/m³2026-05-25: 81.6 µg/m³2026-05-26: no daily value, only 13 of the 18 hours a day needs2026-05-27: no daily value, only 14 of the 18 hours a day needs2026-05-28: 59.2 µg/m³2026-05-29: 52.3 µg/m³2026-05-30: 51.4 µg/m³2026-05-31: 72.2 µg/m³2026-06-01: 69.5 µg/m³2026-06-02: 57.7 µg/m³2026-06-03: 32.9 µg/m³2026-06-04: 40.2 µg/m³2026-06-05: 73.8 µg/m³2026-06-06: 69.3 µg/m³2026-06-07: 64.4 µg/m³2026-06-08: 57.2 µg/m³2026-06-09: 60.7 µg/m³2026-06-10: 59.6 µg/m³2026-06-11: 37.8 µg/m³2026-06-12: 33.5 µg/m³2026-06-13: 41.1 µg/m³2026-06-14: 70.7 µg/m³2026-06-15: 84.9 µg/m³2026-06-16: 102.0 µg/m³2026-06-17: 99.2 µg/m³2026-06-18: 111.0 µg/m³2026-06-19: 70.1 µg/m³2026-06-20: 34.9 µg/m³2026-06-21: 55.7 µg/m³2026-06-22: 47.8 µg/m³2026-06-23: 80.8 µg/m³2026-06-24: 84.5 µg/m³2026-06-25: 55.1 µg/m³2026-06-26: 39.7 µg/m³2026-06-27: 77.7 µg/m³2026-06-28: 128.0 µg/m³2026-06-29: 154.0 µg/m³2026-06-30: 68.9 µg/m³2026-07-01: 76.6 µg/m³2026-07-02: 82.8 µg/m³2026-07-03: 77.5 µg/m³2026-07-04: 79.3 µg/m³2026-07-05: 79.3 µg/m³2026-07-06: 66.9 µg/m³2026-07-07: no daily value, only 13 of the 18 hours a day needs2026-07-08: no daily value, only 14 of the 18 hours a day needs2026-07-09: 35.2 µg/m³2026-07-10: 49.4 µg/m³2026-07-11: 42.2 µg/m³2026-07-12: 58.1 µg/m³2026-07-13: 77.9 µg/m³2026-07-14: 61.1 µg/m³2026-07-15: 21.5 µg/m³2026-07-16: no daily value, only 11 of the 18 hours a day needs2026-07-17: no daily value, no readings from the monitor2026-07-18: no daily value, only 17 of the 18 hours a day needs2026-07-19: 65.5 µg/m³2026-07-20: 60.0 µg/m³2026-07-21: no daily value, only 14 of the 18 hours a day needs2026-07-22: no daily value, only 15 of the 18 hours a day needs2026-07-23: 18.3 µg/m³2026-07-24: 54.9 µg/m³2026-07-25: 22.6 µg/m³2026-07-26: 21.4 µg/m³2026-07-27: 17.1 µg/m³2026-07-28: no daily value, only 12 of the 18 hours a day needs2026-07-29: no daily value, only 13 of the 18 hours a day needs2026-07-30: 60.3 µg/m³2026-07-31: 26.7 µg/m³2026-08-01: 51.4 µg/m³2026-08-02: 20.9 µg/m³2026-08-03: 32.6 µg/m³2026-08-04: 47.6 µg/m³2026-08-05: 56.0 µg/m³2026-08-06: 63.8 µg/m³2026-08-07: 42.5 µg/m³2026-08-08: 26.2 µg/m³2026-08-09: 84.2 µg/m³2026-08-10: 94.9 µg/m³2026-08-11: no daily value, only 13 of the 18 hours a day needs2026-08-12: no daily value, only 14 of the 18 hours a day needs2026-08-13: 72.4 µg/m³2026-08-14: 76.5 µg/m³2026-08-15: 25.9 µg/m³2026-08-16: 48.4 µg/m³2026-08-17: 87.3 µg/m³2026-08-18: 78.6 µg/m³2026-08-19: 24.4 µg/m³2026-08-20: 24.4 µg/m³2026-08-21: 42.5 µg/m³2026-08-22: 59.3 µg/m³2026-08-23: 82.2 µg/m³2026-08-24: 126.0 µg/m³2026-08-25: 75.2 µg/m³2026-08-26: 18.0 µg/m³2026-08-27: 22.9 µg/m³2026-08-28: 23.4 µg/m³2026-08-29: 18.5 µg/m³2026-08-30: 32.1 µg/m³2026-08-31: 24.6 µg/m³2026-09-01: 23.5 µg/m³2026-09-02: 19.3 µg/m³2026-09-03: 33.6 µg/m³2026-09-04: 32.9 µg/m³2026-09-05: 40.5 µg/m³2026-09-06: 35.7 µg/m³2026-09-07: 52.3 µg/m³2026-09-08: 53.1 µg/m³2026-09-09: 41.2 µg/m³2026-09-10: 27.3 µg/m³2026-09-11: 28.2 µg/m³2026-09-12: 34.7 µg/m³2026-09-13: 63.4 µg/m³2026-09-14: 40.4 µg/m³2026-09-15: no daily value, only 11 of the 18 hours a day needs2026-09-16: no daily value, only 14 of the 18 hours a day needs2026-09-17: 23.9 µg/m³2026-09-18: 25.2 µg/m³2026-09-19: 21.8 µg/m³2026-09-20: 15.1 µg/m³2026-09-21: 22.3 µg/m³2026-09-22: 30.3 µg/m³2026-09-23: 23.4 µg/m³2026-09-24: 16.2 µg/m³2026-09-25: 21.7 µg/m³2026-09-26: 22.3 µg/m³2026-09-27: 20.3 µg/m³2026-09-28: 21.7 µg/m³2026-09-29: 23.7 µg/m³2026-09-30: 22.1 µg/m³2026-10-01: no daily value, no readings from the monitor2026-10-02: no daily value, no readings from the monitor2026-10-03: no daily value, no readings from the monitor2026-10-04: no daily value, no readings from the monitor
229 of 257 measured days were over the WHO 24-hour guideline (15 µg/m³). 108 days without a value: 25 with no readings from the monitor, 54 with readings for part of the day (a day needs 18 hours), 29 with readings left out by our checks; point at a grey square for its reason (why days go blank). One row per month, one square per local day.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Hour by hour

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

Where it stood each day

Top 10Top 100#1#10#100#1,000#3,193NovDecJanFebMarAprMayJunJulAugSep#275
Its rank on each day's world board, #1 being the most polluted city that day. Higher is worse. Each gridline down is ten times the rank above it (#1, #10, #100, #1,000), so the top places get the most room. See it among every city.

2026 against 2025, month by month

15Jan 2026: 21.7 µg/m³JanFeb 2025: 20.2 µg/m³Feb 2026: 15.6 µg/m³FebMar 2025: 12.3 µg/m³Mar 2026: 17.5 µg/m³MarApr 2025: 37.0 µg/m³Apr 2026: 32.3 µg/m³AprMay 2025: 54.2 µg/m³May 2026: 64.3 µg/m³MayJun 2025: 73.2 µg/m³Jun 2026: 68.8 µg/m³JunJul 2025: 61.6 µg/m³Jul 2026: 52.5 µg/m³JulAug 2025: 48.6 µg/m³Aug 2026: 51.1 µg/m³AugSep 2025: 26.8 µg/m³Sep 2026: 29.9 µg/m³SepOct 2025: 20.3 µg/m³OctNovDec 2025: 15.1 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

Monitors

PM2.5 from 1 reference monitor. None of them reported in the last 24 hours.

StationOperatorType
LajaPermission requested (Chile MMA, SINCA, 2026-10-01)Chile - SINCAReference

The city's value is the median of its reference monitors each hour, when at least a third of them report (three are always enough); 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.

Use this page

SmogRank, PM2.5 daily means, Laja, Chile, 5 Oct 2025 – 30 Sep 2026, smogrank.com/cl/laja (accessed 5 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Other cities in Chile

30-day averages, US AQI. All of Chile.

Updated 2026-10-05 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.