Puerto Rico · America/Puerto_Rico

San Juan air quality

Good

CAMS model-based US AQI estimate

Highest pollutant sub-index: PM2.5

Model values for Oct 02 03:00 AST · CAMS model estimate, may differ from monitoring stations and street-level conditions

Data may be delayed

AirNow by Skymory is an independent service; it is not affiliated with or endorsed by U.S. EPA or the official AirNow service.

Pollutants now (modeled)

PM2.5Fine particles3.6 µg/m³
PM10Coarse particles5.7 µg/m³
O3Ozone32.6 µg/m³
NO2Nitrogen dioxide0.7 µg/m³
SO2Sulphur dioxide0.8 µg/m³
COCarbon monoxide97.5 µg/m³

Weather in San Juan

See the temperature, rain and wind forecast for San Juan.

San Juan weather forecast on Skymory

Next 24 hours: PM2.5

Modeled PM2.5 forecast (µg/m³) · 2.0–6.0; actual sample times, no interpolated hourly values.

Pollutant forecast

Hourly model samples in local time; no interpolation.

Local time	PM2.5 µg/m³	PM10 µg/m³	O3 µg/m³	NO2 µg/m³	SO2 µg/m³	CO µg/m³
Oct 02 04:00 AST	3.2	5.2	30.9	0.7	0.6	97.9
Oct 02 05:00 AST	2.9	4.8	29.2	0.7	0.5	98.2
Oct 02 06:00 AST	2.4	4.0	27.6	0.7	0.4	98.6
Oct 02 07:00 AST	2.2	3.6	26.9	0.7	0.4	99.0
Oct 02 08:00 AST	2.3	3.8	32.2	0.4	0.3	98.5
Oct 02 09:00 AST	2.2	3.7	35.1	0.3	0.3	98.0
Oct 02 10:00 AST	2.1	3.5	36.4	0.3	0.3	97.8
Oct 02 11:00 AST	2.0	3.3	37.8	0.2	0.4	97.5
Oct 02 12:00 AST	2.1	3.4	38.2	0.2	0.6	97.2
Oct 02 13:00 AST	2.2	3.6	38.6	0.2	0.9	96.8
Oct 02 14:00 AST	2.5	4.0	39.6	0.2	1.2	95.9
Oct 02 15:00 AST	2.9	4.5	40.6	0.2	1.5	95.0
Oct 02 16:00 AST	3.3	4.9	43.7	0.3	1.8	93.9
Oct 02 17:00 AST	3.6	5.3	41.6	0.4	2.1	93.6
Oct 02 18:00 AST	4.1	6.1	39.8	0.6	2.3	93.6
Oct 02 19:00 AST	4.6	6.7	38.5	0.8	2.2	93.1
Oct 02 20:00 AST	4.6	6.7	38.3	0.8	2.2	92.5
Oct 02 21:00 AST	4.7	7.0	38.6	0.8	2.2	91.8
Oct 02 22:00 AST	4.9	7.3	39.0	0.8	2.1	91.3
Oct 02 23:00 AST	5.1	7.7	38.5	0.8	2.1	91.0
Oct 03 00:00 AST	5.4	8.2	38.3	0.8	2.1	90.9
Oct 03 01:00 AST	5.6	8.7	38.1	0.8	2.2	91.0
Oct 03 02:00 AST	5.8	9.1	37.7	0.8	2.2	91.3
Oct 03 03:00 AST	6.0	9.4	37.0	0.8	2.2	91.6

Data details: about this air quality estimate

Values are modeled by the Copernicus Atmosphere Monitoring Service (CAMS) global forecast, extracted and converted by Skymory for this city. They are model estimates on a coarse grid, not measurements from monitoring stations, and they do not resolve street-level exposure.

Model initialization: 2026-10-01T12:00:00+00:00. Values valid: Oct 02 03:00 AST. Retrieved: 2026-10-02T04:38:57.559474+00:00.
Page generated from a snapshot with data state STALE_USABLE; model age 19.9 hours at generation.
Nearest valid 0.4° model grid cell, about 13 km from the city point.
Gases are converted with matching model-level 137 temperature, humidity, surface pressure (lnsp) and hybrid coefficients; particulate matter is read directly from the surface fields.
AQI estimate completeness: COMPLETE (COMPLETE means all six pollutants have a complete model window).

The AQI estimate applies EPA breakpoints (May 2026) to explicit trailing model windows (PM 24 h, CO 8 h, NO2 1 h, SO2 and O3 per EPA rules). It is not a station observation, official daily maximum or NowCast, and the official AQI field remains unavailable.

Averaging windows used

CO: 8h window
NO2: 1h window
O3: 1h, 8h window
PM10: 24h window
PM2.5: 24h window
SO2: 1h, 24h window

Surface compatibility by pollutant

Pollutant	Surface compatibility
PM2.5	DIRECT_SURFACE
PM10	DIRECT_SURFACE
O3	DERIVABLE_SURFACE
NO2	DERIVABLE_SURFACE
SO2	DERIVABLE_SURFACE
CO	DERIVABLE_SURFACE

Source and license

Contains modified Copernicus Atmosphere Monitoring Service information 2026; city extraction and concentration conversion. CAMS global atmospheric composition forecasts (ECMWF/CAMS). CC BY 4.0.

Provider times stay separate from page generation: collecting data or regenerating this page never resets the source time. Data sources and methodology

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