Interactive map showing current coral reef bleaching alert levels at 213 NOAA Coral Reef Watch virtual stations worldwide. Updated daily from satellite sea surface temperature data.

Explore live air quality readings from thousands of monitoring stations worldwide. This interactive map shows PM2.5, PM10 and PM1 particulate matter concentrations colour-coded by US EPA AQI category, updated hourly from the OpenAQ global network.

Explore the complete US national transit network on one interactive map. Filter by state and mode to see every bus, subway, light rail, commuter rail, ferry, and streetcar route in all 50 states, drawn from the Bureau of Transportation Statistics National Transit Map.

Explore NOAA’s Marine Trackline Geophysical Database on an interactive world map. Visualize bathymetry, gravity, magnetics, seismics, and aeromagnetic survey routes collected from 1939 to the present.

Explore over 400,000 hailstorm events across the United States from 1955 to 2024. Data from NOAA’s Storm Prediction Center, filterable by hail size and decade.

Explore over 50,000 Low Income Housing Tax Credit (LIHTC) properties across the United States with this interactive HUD map. Filter by state, year placed in service, and project size. Click any marker for project name, address, unit count, and tax credit allocation.

Explore 887 significant volcanic eruptions worldwide with this interactive NOAA map. Filter by Volcanic Explosivity Index (VEI), time period, associated tsunamis, and fatalities. Each marker is sized and coloured by VEI, from minor eruptions to mega-colossal events.

Explore the geology of the contiguous United States with this interactive map powered by the USGS State Geologic Map Compilation (SGMC). Filter by state, click any polygon for unit details, and discover rock types from sedimentary basins to ancient metamorphic terranes.

Explore all operating surface and underground coal mines in the United States on an interactive map. Data from the U.S. Energy Information Administration (EIA), filterable by mine type and coal region.

Explore the complete National Register of Historic Places on an interactive map. Search by resource type — buildings, districts, sites, structures, and objects — and zoom in on National Historic Landmarks highlighted in gold across all 50 states.