Air quality in San Borja, Lima, Peru today
Mr. Duck’s Air Quality Score
Moderate air today for San Borja, Lima, Peru
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in San Borja is currently classified as Moderate. The main pollutant identified is PM2.5, fine particulate matter that is being measured alongside other particles such as PM10.
According to the latest data shown via OpenAQ, the PM2.5 reference value stands at 24.5 and the PM10 reference value is 70.18, based on five valid measurements taken today. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.
Latest sensor values
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
What the data includes
The San Borja air‑quality record consists of a single monitoring station that reports six common pollutants: carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤10 µm (PM10), particulate matter ≤2.5 µm (PM2.5) and sulfur dioxide (SO₂). For each pollutant the dataset contains one value, so the range of observations is limited to that single measurement.
The most recent data were uploaded on 2026‑02‑10 at 16:00 UTC for NO₂, O₃, PM10, PM2.5 and SO₂, while the CO reading dates back to 2017‑07‑20 at 06:00 UTC. This means that five of the six pollutants have very fresh information (updated within the last seven days), whereas the carbon monoxide figure is over eight years old and flagged as “old data”. All values are identical across their minimum, median and maximum statistics because each pollutant is represented by only one record.
Typical concentrations recorded at the San Borja site are 0.7 ppm for CO, 3.12 µg/m³ for NO₂, 19.84 µg/m³ for O₃, 70.18 µg/m³ for PM10, 24.5 µg/m³ for PM2.5 and 11.54 µg/m³ for SO₂. Because there is no spread of measurements, the dataset cannot show variability over time or across different locations within the district. Users should keep in mind that air‑quality conditions can differ throughout San Borja and that the single‑station coverage provides only a snapshot rather than a comprehensive picture of the city’s atmosphere.
Learn more about sources and filtering: About the data.
Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)
Latest sensor values (bars)
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
Data notes
The data shown for San Borja reflects five valid measurements and is marked as Updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 16:00 UTC. This snapshot provides a brief overview of current conditions; however, air quality can vary across different neighborhoods and times of day within the city, so values may not represent every location or moment precisely.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| SAN BORJA | co | 0.7 | ppm | 2017-07-20 06:00 UTC |
| SAN BORJA | no2 | 3.12 | µg/m³ | 2026-02-10 16:00 UTC |
| SAN BORJA | o3 | 19.84 | µg/m³ | 2026-02-10 16:00 UTC |
| SAN BORJA | pm10 | 70.18 | µg/m³ | 2026-02-10 16:00 UTC |
| SAN BORJA | pm25 | 24.5 | µg/m³ | 2026-02-10 16:00 UTC |
| SAN BORJA | so2 | 11.54 | µg/m³ | 2026-02-10 16:00 UTC |