In schools and other public areas, population gathering is inevitable. Ventilation situation has become a very important index to be measured to indicate the population gathering scenarios, as to reduce the cross-infection.

With the continuous in-depth development of smart homes, vacuum cleaners and sweeping robots have gradually become popular. At present, the development of vacuum cleaners and sweeping robots has been transformed from functional to intelligent. From basic cleaning functions to the improvement of cleaning efficiency and cleaning quality, cleaning planning products have become the industry standard, and the user experience has been significantly improved. Focusing on the improvement of sensors and algorithms, cleaning planning products have once again detonated the robot sweeping market, making the vacuum cleaner and sweeping robot market enter a new era of intelligence.

With the rise of the tertiary industry, the catering service industry has developed rapidly, bringing convenience to people's lives, but the direct emission of oil fume also causes pollution to the atmospheric environment. The composition of oil fume gas is complex, and the particulate matter and volatile gaseous organic matter in oil fume gas are one of the important reasons for the formation of haze. In order to effectively promote the treatment of atmospheric environment, oil fume treatment is imperative.

Chronic respiratory diseases are a series of diseases represented by chronic obstructive pulmonary disease (hereinafter referred to as COPD) and asthma. It is one of the four major chronic diseases that seriously affect the health of Chinese residents.

Natural gas is a new and clean energy and gas demand is highly robust since the beginning of the Covid-19 outbreak, shielded to some extent by extended heating season and domestic price cuts that helps the gas remains competitive against traditional energy source. Natural gas consumption is rising year by year. Accordingly gas meter industry is enjoying the prosperity for development.