SmogRank / World / Chile / Valparaiso / August 2025

Most people breathing unhealthy air in Valparaiso, Chile, August 2025

4 cities in Valparaiso, Chile measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 31 days. The most people breathing unhealthy air: Quillota, Chile, about 2.19K on an average day. A city needs measurements on 70% of the days to be ranked.

About 2.53K people in these 4 cities breathed unhealthy air on an average day of August 2025.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Quillota 2.19K 2K0

Every city in Valparaiso, Chile ranked for August 2025 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.

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

All cities in the world, August 2025 · All cities in Chile, August 2025 · Valparaiso now

Use this board

SmogRank, most polluted cities in Valparaiso, Chile, by people breathing unhealthy air, PM2.5, August 2025, smogrank.com/cl/region/valparaiso/history/2025-08?by=people (accessed 7 Oct 2026).

Download top 10 by average (PNG)

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.