{"version":"1.0","type":"rich","title":"Assignment 4","description":"Three linked D3.js v7 views explore one year of synthetic air-quality data from eight urban stations: a deviation heatmap shows how daily PM2.5 departs from each station’s baseline, a slope chart compares winter and summer means, and a scatter plot fits `leastSquares` trend lines to NO2 versus PM2.5 for normal and wildfire-smoke days. Clicking any station highlights it across all views, while a `d3.brush` strip filters the date range. The SVG charts use `d3.scaleLinear`, `d3.axisBottom`, and `d3.group` for aggregation.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/8bbd2c97f3b848e982af021f6a372fde?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}