/ The set of pictures you want to draw is more than 15,000 pictures. This is a big problem for interactive processing stacks (printing ui.Chart, instead of generating a table and running e.g. Export.toDrive).
If you want to browse quickly, you can limit the collected images to e.g. every 5th or 10th image by converting to a list and using the slice function (see below).
When we load the amount of the icon, there will be an overrun problem. There are several problems here. One is that the research area is too complicated, and the other is that we need to simplify the image range. Reduce the output of more than 5000 scenes of image range, the problem appears as follows:
Original code:
var ROI = ee.FeatureCollection("users/enigma_srl/singrauli");
var collection = ee.ImageCollection('COPERNICUS/S5P/OFFL/L3_NO2') .select('tropospheric_NO2_column_number_density')
.filterDate('2020-01-01', '2022-12-31')
.filterBounds (ROI) ;
var Collection_Mean = collection.mean();
//print(Collection_Mean);
// Define a chart with one series in the forest region, averaged by DOY.
var chart1 =