Thank you so much for your valuable feedback, @adamschroeder I’ve implemented the suggested changes by sorting the country dropdown in alphabetical order and initializing the gauges from 0 to 100 to match the data range. Since I’m using the average PM2.5 air quality value, with the highest observed at 98.4 µg/m³ in Riyadh (a city in Saudi Arabia) in 2021, this range should be appropriate. However, the gauge colors are still not displaying as expected despite following the guidance.