World Toilet Day is observed annually on November 19 to raise awareness about the global sanitation crisis and promote sustainable sanitation for all ¹. Unfortunately, I couldn't find any information related to Airtel's involvement or initiatives on World Toilet Day.

However, I can tell you that World Toilet Day was first unofficially established in 2001 by the World Toilet Organization and became an official United Nations day in 2013 ¹. The day aims to inspire action to tackle the global sanitation crisis, as 4.2 billion people worldwide live without safely managed sanitation, and 673 million people practice open defecation ¹[2).

Each year, World Toilet Day has a specific theme. For example, in 2022, the theme was "Groundwater and Sanitation - Making the Invisible Visible" ¹. The day is marked by various events, campaigns, and activities worldwide, including social media campaigns, workshops, and art installations ¹[2).

Would you like to know more about World Toilet Day or its themes over the years?