A line chart tracks NYC’s weekly PM2.5 air pollution levels from February to May 2020, revealing a declining trend during the early COVID-19 period. The visualization uses D3 v5’s `scaleTime`, `scaleLinear`, `axisLeft`, `axisBottom`, and `line` generator, rendered as an SVG on a blue background with a lavender stroke. Data comes from the NYC government website, loaded via `csv()`. The chart includes labeled axes for time and PM2.5 concentration, with gridlines, but no data points or smoothing curves.