SmogRank / Chile / O'Higgins Region

Air quality in Rengo

O'Higgins Region, Chile. PM2.5 from 1 reference monitor, updated hourly.

75US AQI
Moderate

Latest hour (03:00 UTC), 1.5× the WHO 24-hour guideline. PM2.5 22.0 µg/m³.

Rank, worst first

24 hours–not enough data
7 days#178of 2,603, at 74 US AQI (21.2 µg/m³)
30 days#316of 2,623, at 77 US AQI (23.3 µg/m³)
This year#257of 2,447, at 96 US AQI (33.1 µg/m³)

Why it ranks here

Seasonal. Over the past year its worst months were May, June, averaging up to 57.4 µg/m³ against 17.0 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

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

The last 12 months, day by day

1102031Nov 2025DecJan 2026FebMarAprMayJunJulAugSepOct2025-11-01: 17.5 µg/m³2025-11-02: 16.4 µg/m³2025-11-03: 18.4 µg/m³2025-11-04: 16.8 µg/m³2025-11-05: 20.4 µg/m³2025-11-06: no data2025-11-07: 16.5 µg/m³2025-11-08: 16.1 µg/m³2025-11-09: no data2025-11-10: 16.5 µg/m³2025-11-11: 15.1 µg/m³2025-11-12: 15.5 µg/m³2025-11-13: 18.0 µg/m³2025-11-14: 20.8 µg/m³2025-11-15: 20.0 µg/m³2025-11-16: 18.1 µg/m³2025-11-17: 16.1 µg/m³2025-11-18: 17.6 µg/m³2025-11-19: 18.0 µg/m³2025-11-20: 20.8 µg/m³2025-11-21: 20.2 µg/m³2025-11-22: 19.3 µg/m³2025-11-23: 19.7 µg/m³2025-11-24: 17.4 µg/m³2025-11-25: 17.9 µg/m³2025-11-26: 17.2 µg/m³2025-11-27: 18.2 µg/m³2025-11-28: 15.3 µg/m³2025-11-29: 14.9 µg/m³2025-11-30: 14.1 µg/m³2025-12-01: 14.5 µg/m³2025-12-02: 15.6 µg/m³2025-12-03: 17.6 µg/m³2025-12-04: 17.5 µg/m³2025-12-05: 18.5 µg/m³2025-12-06: 19.3 µg/m³2025-12-07: 17.1 µg/m³2025-12-08: no data2025-12-09: 18.9 µg/m³2025-12-10: 16.8 µg/m³2025-12-11: 15.5 µg/m³2025-12-12: 16.1 µg/m³2025-12-13: 14.6 µg/m³2025-12-14: 14.2 µg/m³2025-12-15: 14.7 µg/m³2025-12-16: 14.7 µg/m³2025-12-17: 18.8 µg/m³2025-12-18: 21.2 µg/m³2025-12-19: no data2025-12-20: 13.6 µg/m³2025-12-21: no data2025-12-22: 14.9 µg/m³2025-12-23: 15.9 µg/m³2025-12-24: 15.7 µg/m³2025-12-25: 15.9 µg/m³2025-12-26: 18.3 µg/m³2025-12-27: 22.3 µg/m³2025-12-28: 18.5 µg/m³2025-12-29: 18.2 µg/m³2025-12-30: no data2025-12-31: 21.0 µg/m³2026-01-01: 19.2 µg/m³2026-01-02: 16.9 µg/m³2026-01-03: 15.8 µg/m³2026-01-04: 15.5 µg/m³2026-01-05: 16.1 µg/m³2026-01-06: no data2026-01-07: 17.3 µg/m³2026-01-08: 18.5 µg/m³2026-01-09: 20.0 µg/m³2026-01-10: 18.5 µg/m³2026-01-11: 18.4 µg/m³2026-01-12: 17.5 µg/m³2026-01-13: 17.8 µg/m³2026-01-14: 16.5 µg/m³2026-01-15: 17.5 µg/m³2026-01-16: 21.3 µg/m³2026-01-17: 19.2 µg/m³2026-01-18: 23.2 µg/m³2026-01-19: 29.8 µg/m³2026-01-20: 30.4 µg/m³2026-01-21: 27.3 µg/m³2026-01-22: 27.3 µg/m³2026-01-23: 24.9 µg/m³2026-01-24: 23.0 µg/m³2026-01-25: 17.9 µg/m³2026-01-26: 14.8 µg/m³2026-01-27: 13.8 µg/m³2026-01-28: 16.2 µg/m³2026-01-29: 18.7 µg/m³2026-01-30: 16.3 µg/m³2026-01-31: 15.4 µg/m³2026-02-01: 17.9 µg/m³2026-02-02: 16.8 µg/m³2026-02-03: 14.9 µg/m³2026-02-04: 14.1 µg/m³2026-02-05: no data2026-02-06: 15.8 µg/m³2026-02-07: 18.3 µg/m³2026-02-08: 15.8 µg/m³2026-02-09: no data2026-02-10: no data2026-02-11: 14.6 µg/m³2026-02-12: 16.8 µg/m³2026-02-13: 17.3 µg/m³2026-02-14: 20.0 µg/m³2026-02-15: 23.0 µg/m³2026-02-16: 22.2 µg/m³2026-02-17: 19.4 µg/m³2026-02-18: 17.3 µg/m³2026-02-19: 16.8 µg/m³2026-02-20: 17.5 µg/m³2026-02-21: 19.6 µg/m³2026-02-22: 20.8 µg/m³2026-02-23: 19.5 µg/m³2026-02-24: 19.2 µg/m³2026-02-25: 18.5 µg/m³2026-02-26: 20.2 µg/m³2026-02-27: 18.4 µg/m³2026-02-28: 14.6 µg/m³2026-03-01: 14.7 µg/m³2026-03-02: 15.2 µg/m³2026-03-03: 16.4 µg/m³2026-03-04: 15.0 µg/m³2026-03-05: 16.4 µg/m³2026-03-06: 19.2 µg/m³2026-03-07: 18.3 µg/m³2026-03-08: 17.8 µg/m³2026-03-09: 18.4 µg/m³2026-03-10: 18.2 µg/m³2026-03-11: no data2026-03-12: 19.8 µg/m³2026-03-13: 18.6 µg/m³2026-03-14: 19.0 µg/m³2026-03-15: 16.0 µg/m³2026-03-16: 14.4 µg/m³2026-03-17: 13.7 µg/m³2026-03-18: 16.2 µg/m³2026-03-19: 16.9 µg/m³2026-03-20: 14.6 µg/m³2026-03-21: 16.2 µg/m³2026-03-22: 14.9 µg/m³2026-03-23: 18.0 µg/m³2026-03-24: 16.2 µg/m³2026-03-25: 14.8 µg/m³2026-03-26: 22.4 µg/m³2026-03-27: 27.0 µg/m³2026-03-28: 34.7 µg/m³2026-03-29: 23.4 µg/m³2026-03-30: 22.1 µg/m³2026-03-31: 24.7 µg/m³2026-04-01: 25.4 µg/m³2026-04-02: 29.0 µg/m³2026-04-03: 33.7 µg/m³2026-04-04: 24.3 µg/m³2026-04-05: 23.4 µg/m³2026-04-06: 25.7 µg/m³2026-04-07: 22.0 µg/m³2026-04-08: 26.3 µg/m³2026-04-09: 33.8 µg/m³2026-04-10: 25.2 µg/m³2026-04-11: no data2026-04-12: no data2026-04-13: no data2026-04-14: 22.9 µg/m³2026-04-15: 26.1 µg/m³2026-04-16: 26.8 µg/m³2026-04-17: 33.6 µg/m³2026-04-18: 20.6 µg/m³2026-04-19: 27.3 µg/m³2026-04-20: 18.4 µg/m³2026-04-21: 21.0 µg/m³2026-04-22: 23.1 µg/m³2026-04-23: 24.5 µg/m³2026-04-24: 30.0 µg/m³2026-04-25: 35.0 µg/m³2026-04-26: 27.9 µg/m³2026-04-27: no data2026-04-28: no data2026-04-29: 29.4 µg/m³2026-04-30: 26.3 µg/m³2026-05-01: 26.3 µg/m³2026-05-02: 32.7 µg/m³2026-05-03: 33.5 µg/m³2026-05-04: 34.3 µg/m³2026-05-05: 43.5 µg/m³2026-05-06: 36.3 µg/m³2026-05-07: 18.8 µg/m³2026-05-08: 20.9 µg/m³2026-05-09: 23.5 µg/m³2026-05-10: 44.8 µg/m³2026-05-11: 40.2 µg/m³2026-05-12: 31.1 µg/m³2026-05-13: 49.8 µg/m³2026-05-14: 70.5 µg/m³2026-05-15: 61.5 µg/m³2026-05-16: 57.4 µg/m³2026-05-17: 63.7 µg/m³2026-05-18: 46.4 µg/m³2026-05-19: 43.1 µg/m³2026-05-20: 68.9 µg/m³2026-05-21: 69.5 µg/m³2026-05-22: 77.0 µg/m³2026-05-23: 105.0 µg/m³2026-05-24: 84.4 µg/m³2026-05-25: 71.2 µg/m³2026-05-26: 55.0 µg/m³2026-05-27: 58.3 µg/m³2026-05-28: 75.9 µg/m³2026-05-29: 48.8 µg/m³2026-05-30: 64.8 µg/m³2026-05-31: 63.7 µg/m³2026-06-01: 56.1 µg/m³2026-06-02: 85.5 µg/m³2026-06-03: 98.1 µg/m³2026-06-04: 58.8 µg/m³2026-06-05: 50.2 µg/m³2026-06-06: 69.8 µg/m³2026-06-07: 63.6 µg/m³2026-06-08: 63.6 µg/m³2026-06-09: 58.1 µg/m³2026-06-10: 48.6 µg/m³2026-06-11: 36.7 µg/m³2026-06-12: 55.7 µg/m³2026-06-13: 61.1 µg/m³2026-06-14: 61.7 µg/m³2026-06-15: 61.5 µg/m³2026-06-16: 60.5 µg/m³2026-06-17: 80.4 µg/m³2026-06-18: 79.6 µg/m³2026-06-19: 58.3 µg/m³2026-06-20: 49.5 µg/m³2026-06-21: 29.8 µg/m³2026-06-22: 50.4 µg/m³2026-06-23: 35.3 µg/m³2026-06-24: 49.6 µg/m³2026-06-25: 59.8 µg/m³2026-06-26: 57.6 µg/m³2026-06-27: 45.9 µg/m³2026-06-28: 43.5 µg/m³2026-06-29: 40.4 µg/m³2026-06-30: 53.2 µg/m³2026-07-01: 53.3 µg/m³2026-07-02: 67.3 µg/m³2026-07-03: 60.8 µg/m³2026-07-04: 67.9 µg/m³2026-07-05: 83.1 µg/m³2026-07-06: 57.3 µg/m³2026-07-07: 74.3 µg/m³2026-07-08: 78.4 µg/m³2026-07-09: 66.2 µg/m³2026-07-10: 61.4 µg/m³2026-07-11: 48.4 µg/m³2026-07-12: 30.3 µg/m³2026-07-13: 53.7 µg/m³2026-07-14: 56.9 µg/m³2026-07-15: 56.5 µg/m³2026-07-16: 25.7 µg/m³2026-07-17: 14.8 µg/m³2026-07-18: 14.7 µg/m³2026-07-19: 38.6 µg/m³2026-07-20: 37.4 µg/m³2026-07-21: 19.9 µg/m³2026-07-22: no data2026-07-23: no data2026-07-24: 26.9 µg/m³2026-07-25: 37.8 µg/m³2026-07-26: 43.7 µg/m³2026-07-27: 29.3 µg/m³2026-07-28: 27.2 µg/m³2026-07-29: 37.0 µg/m³2026-07-30: 34.0 µg/m³2026-07-31: 23.9 µg/m³2026-08-01: 27.6 µg/m³2026-08-02: 22.4 µg/m³2026-08-03: 34.6 µg/m³2026-08-04: 35.0 µg/m³2026-08-05: 35.0 µg/m³2026-08-06: 31.5 µg/m³2026-08-07: 30.6 µg/m³2026-08-08: 22.3 µg/m³2026-08-09: 27.7 µg/m³2026-08-10: no data2026-08-11: no data2026-08-12: no data2026-08-13: 51.6 µg/m³2026-08-14: 36.2 µg/m³2026-08-15: no data2026-08-16: no data2026-08-17: 39.3 µg/m³2026-08-18: 38.5 µg/m³2026-08-19: 35.3 µg/m³2026-08-20: 34.7 µg/m³2026-08-21: 41.2 µg/m³2026-08-22: 51.4 µg/m³2026-08-23: 59.8 µg/m³2026-08-24: 45.8 µg/m³2026-08-25: 35.5 µg/m³2026-08-26: 20.8 µg/m³2026-08-27: 25.1 µg/m³2026-08-28: 24.5 µg/m³2026-08-29: 29.3 µg/m³2026-08-30: 20.7 µg/m³2026-08-31: 19.5 µg/m³2026-09-01: 24.4 µg/m³2026-09-02: 20.5 µg/m³2026-09-03: 16.9 µg/m³2026-09-04: 19.8 µg/m³2026-09-05: 25.8 µg/m³2026-09-06: 32.9 µg/m³2026-09-07: 21.5 µg/m³2026-09-08: 21.5 µg/m³2026-09-09: 22.6 µg/m³2026-09-10: 27.0 µg/m³2026-09-11: 22.4 µg/m³2026-09-12: 20.4 µg/m³2026-09-13: 28.4 µg/m³2026-09-14: 23.6 µg/m³2026-09-15: 24.0 µg/m³2026-09-16: 25.9 µg/m³2026-09-17: 25.2 µg/m³2026-09-18: 24.3 µg/m³2026-09-19: 23.1 µg/m³2026-09-20: 19.1 µg/m³2026-09-21: 17.5 µg/m³2026-09-22: 18.5 µg/m³2026-09-23: 28.0 µg/m³2026-09-24: 40.2 µg/m³2026-09-25: 26.8 µg/m³2026-09-26: 28.1 µg/m³2026-09-27: 21.7 µg/m³2026-09-28: 15.0 µg/m³2026-09-29: 16.1 µg/m³2026-09-30: 19.8 µg/m³2026-10-01: 21.2 µg/m³
306 of 335 measured days were over the WHO 24-hour guideline (15 µg/m³). 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

Last 4 days, hour by hour

15302026-10-01 21:00 UTC: 21.0 µg/m³2026-10-01 23:00 UTC: 21.0 µg/m³2026-10-02 00:00 UTC: 22.0 µg/m³2026-10-02 01:00 UTC: 22.0 µg/m³2026-10-02 02:00 UTC: 22.0 µg/m³2026-10-02 03:00 UTC: 22.0 µg/m³Sep 29Sep 30Oct 1Oct 2
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Where it stood each day

Top 10Top 100#1#10#100#1,000#2,835NovDecJanFebMarAprMayJunJulAugSep#130
Its rank on each day's world board, #1 being the most polluted city that day. The scale is logarithmic: each step down is ten times as many cities. See it among every city.

2026 against 2025, month by month

15Jan 2025: 17.7 µg/m³Jan 2026: 19.5 µg/m³JanFeb 2025: 21.0 µg/m³Feb 2026: 18.0 µg/m³FebMar 2025: 18.9 µg/m³Mar 2026: 18.4 µg/m³MarApr 2025: 23.8 µg/m³Apr 2026: 26.5 µg/m³AprMay 2025: 41.9 µg/m³May 2026: 52.3 µg/m³MayJun 2025: 55.9 µg/m³Jun 2026: 57.4 µg/m³JunJul 2025: 62.3 µg/m³Jul 2026: 45.7 µg/m³JulAug 2025: 39.0 µg/m³Aug 2026: 33.7 µg/m³AugSep 2025: 26.0 µg/m³Sep 2026: 23.4 µg/m³SepOct 2025: 18.7 µg/m³OctNov 2025: 17.6 µg/m³NovDec 2025: 17.0 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 21.2 µg/m³21.220252025: 21.0 µg/m³21.0
Mean PM2.5 for 25 Sept to 1 Oct in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
RengoPermission 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, Rengo, Chile, 2 Oct 2025 – 1 Oct 2026, smogrank.com/cl/rengo (accessed 2 Oct 2026).

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Other cities in Chile

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

Updated 2026-10-02 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.