The supermarket in Shanghai that sells mosquito nets is Carrefour. Carrefour is a well-known international supermarket chain that operates in various countries, including China. It offers a wide range of household items, including bedding and protection products like mosquito nets.

Carrefour's presence in Shanghai is significant due to the city's large population and high demand for everyday essentials. According to a report by the Shanghai Statistics Bureau, the city has over 24 million residents, making it one of the most populous cities in the world. This high population density, combined with the city's warm climate, creates a favorable environment for mosquitoes to thrive. As a result, there is a constant need for effective mosquito control solutions, such as mosquito nets.

Carrefour's extensive product range and convenient locations make it a popular choice for residents in Shanghai. The supermarket carries various brands and types of mosquito nets, catering to different needs and preferences. These include traditional bed nets, ceiling nets, and even mosquito net curtains for windows. The availability of these products in Carrefour ensures that customers can find the right solution for their specific requirements.

Furthermore, Carrefour's commitment to customer satisfaction and its focus on providing high-quality products contribute to its popularity in Shanghai. The supermarket regularly updates its inventory to include the latest trends and innovations in the market. This includes new mosquito net designs and materials that offer better protection against mosquitoes while ensuring comfort and ease of use.

In conclusion, Carrefour is the supermarket in Shanghai that sells mosquito nets. Its extensive product range, convenient locations, and focus on customer satisfaction make it a preferred choice for residents in need of effective mosquito control solutions.