Environmental capabilities that can be requested in `LookupWeatherRequest`.

| Enums ||
|---|---|
| `CAPABILITY_UNSPECIFIED` | Unspecified capability. |
| `WEATHER` | Weather conditions (temperature, precipitation, wind, UV, etc.). |
| `AIR_QUALITY` | Air quality information (AQI, pollutants, and health recommendations). |
| `POLLEN` | Pollen information (tree, grass, weed, and plant species allergen levels). |