Jamshedpur: Jamshedpur Notified Area Committee (JNAC) Special Officer Sanjay Kumar on Saturday said the national Swachhata rankings of Jamshedpur and Mango had improved a lot. Expressing happiness over the results of Swachhata Sarvekshan 2018, he said a positive and encouraging environment for cleanliness had been created in the city in the six months spent preparing for the national level contest. He said a lot of hard work was done in the six months for making Mango and the rest of the city clean. He said getting the national rank of 20 and 30 was no less encouraging for the city. He said he had hoped that the city would make it to the top 10 slot at national level.