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A front is where two air masses meet; weather often changes as one passes. Blue = colder air moving in (triangles = cold front), red = warmer air moving in (half-circles = warm front), alternating blue/red = stationary, purple = occluded, dashed brown = trough. Symbols point the way the front is moving. Blue H = high pressure (usually fair), red L = low pressure (clouds and rain). Source: NOAA/NWS Weather Prediction Center.
Outlines show the latest hour: orange = Moderate, red = Unhealthy for Sensitive Groups or worse. Tap inside one for details. Source: EPA AirNow.
Shown at your home location if one is saved, otherwise at your current location. Source: Open-Meteo.
Pollen (Google)
Tap the map with the heatmap on for today's tree/grass/weed forecast at that spot.
Pollen stations (AAAAI)
Purple dots are AAAAI National Allergy Bureau stations. Tap one for its latest measured tree, grass, weed, and mold counts.