This area chart tracks NYC PM2.5 air pollution levels from February to May 2020, showing a decline in particulate matter during the early COVID-19 period. The visualization uses D3 v5 with an SVG rendering, employing `scaleTime` and `scaleLinear` for axes, an `area()` generator with `curveBasis` for the smoothed fill, and `axisLeft`/`axisBottom` for ticks. Data is loaded from a local CSV file via `d3.csv` and mapped to the weekly measurements.