{"version":"1.0","type":"rich","title":"Multiple Line plot with Dropdown","description":"A dropdown menu controls the y-axis metric of a multi-line chart tracking London air quality from January 2010 to August 2018, using particulate matter and gas concentration data from the London Datastore. The visualization displays nine color-coded time series, one per year, with a legend on the right. Built with D3 v5, it uses `d3.nest` to group data by year, `d3.line` with `curveBasis` for smoothing, and `d3.scaleTime` for the x-axis. A custom `dropdownMenu` module handles user selection, triggering a 1.5-second `transition.attrTween` animation when switching metrics.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/5b49061f37d043d586d4840e2a8b6ccd?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}