Baseline and endline data collection
The field enumerators collected data at baseline (pre-intervention) and endline (post-intervention) through surveys and structured observations in both intervention and control areas. Before initiating the data collection, the field enumerators collected the lists of waste and sanitation workers officially enlisted under the City Corporation and Municipalities in the selected study areas. Then, they estimated the total number of workers who were not enlisted (informal workers) but were working at the frontline as waste and sanitation workers by discussing with respective authorities and the enlisted workers. After that, they compared it with the number of listed workers and reached the participants based on population proportion to size (listed vs. non-listed) in each area. The listed workers were selected randomly from the list collected from city offices for the survey, and the non-listed workers were selected using snowball sampling. The observation participants were selected purposively from the survey participants, considering the diversity of the age-gender group and work type.The field enumerators conducted face-to-face interviews and structured observations. For the observation, the enumerators accompanied/reached the workers at their workplace and stayed with them during work. Field enumerators collected the baseline data from 20 October 2020 to 15 November 2020 and the endline data from 30 June 2021 to 05 August 2021, roughly after one month of intervention provision.