61492
Some organizations adopt teleworking for environmental reasons , as telework can reduce congestion and air pollution , with fewer cars on the roads .
 congestion
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 congestion