5 µg/m³ measured at Cataño 40, 6 km away, at Aug 06, 12:00PM. The NowCast smoke average is 4 µg/m³ — Good on the US EPA scale.
Air quality is good — ideal for outdoor activities.
No forward smoke forecast is available for this location right now.
● Observed
Background bands (US EPA AQI, 24-h basis): ■ Good · ■ Moderate
| Model | Peak PM2.5 | Peak around |
|---|---|---|
| HRRR-Smoke (NOAA, 3 km) | – | – |
Model values are for the ~10 km grid cell nearest San Juan; the two models are independent and often disagree — treat the higher value as the cautious planning number.
Observations and NowCast are total PM2.5 — wildfire smoke plus every other source — as regulatory monitors measure it, and FireWork models that same total. FireSmoke is a smoke-dispersion model: it estimates the wildfire contribution only, so it reads lower than the monitors whenever other sources matter. The map's optional plume layer is likewise fires-only.
Open the live chart for Cataño 40 — hourly observations, NowCast and both model forecasts.