Environmental watch

What's in the air, water, and ground around here.

Live environmental OSINT for your community, pulled from public federal feeds — the EPA, the USGS, and the National Weather Service. No account, no tracking; every number links back to its public source. Auto-refreshes about every 30 minutes.

🌎 Environmental watch

Live public data for San Marcos · updated 42 min ago · showing last good reading

Air quality

70ModerateUS AQI

PM2.5 18μg/m³PM10 24μg/m³Ozone 131μg/m³NO₂ 2μg/m³

Water monitoring

No live streamgage nearby.

Active alerts

SevereExtreme Heat Watch

Earthquakes · 30 days

M3.8strongest within 250 km

4 km SE of Piru, CA

20 quakes ≥ M2.5

Superfund sites

99active in CA

Nearest: Camp Pendleton Marine Corps Base · 24 km →

Sources: Open-Meteo Air Quality, USGS Water Services, National Weather Service, USGS Earthquake Catalog, EPA National Priorities List. All public, no personal data.

Air quality — full readout

US Air Quality Index 70 (Moderate). Observed Sep 30, 4:00 PM.

17.6 μg/m³PM2.5

23.9 μg/m³PM10

131.0 μg/m³Ozone

1.9 μg/m³NO₂

1.6 μg/m³SO₂

118.0 μg/m³CO

Source: Open-Meteo Air Quality ↗

Active weather alerts1

SevereExtreme Heat Watchuntil Oct 8, 4:00 AM

Extreme Heat Watch issued September 30 at 1:41PM PDT until October 7 at 9:00PM PDT by NWS San Diego CA

San Diego County Coastal Areas; San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Santa Ana Mountains and Foothills; Orange County Coastal; Orange County Inland

Source: National Weather Service ↗