How bad is the air quality in the subway? The air quality sensor tells you~
Air quality has always been a topic of continuous concern. However, people are more concerned about air pollution, while ignoring the potential hazards of subway air. As an important travel tool for modern “workers”, the subway has been closely connected with our lives. Every morning and evening peak period or around major holidays, the subway will fully open the 'full mode'. As the weather gets hotter and hotter, squeezing the subway becomes an unpleasant thing. Under the blessing of the high temperature in summer, although the subway is air-conditioned, it still looks hot and humid. Moreover, the various smells in the air are mixed and very unpleasant. The subway is mostly built deep underground, and the stations are connected by a complicated tunnel system, which is a relatively closed space. The air exchange between the subway station and the outside world can only be carried out through the station entrance and exit and limited tunnel ventilation shafts. According to data, when the peak population density increases in the morning and evening, 5 million small particles can be produced per minute, such as falling dander, sneezing droplets, fibers on clothes, dust on shoe soles, etc. It may be inhaled by people at any time. The high-density crowd in the station releases a lot of peculiar smell and carbon dioxide, coupled with the hot and humid environment of the subway, and no sunlight exposure, it is conducive to the survival of microorganisms or the spread of pathogenic microorganisms. When people of different health levels gather and flow, it is easy to cause tuberculosis, influenza virus, skin disease, dysentery and other diseases to spread and spread. Although my country’s current air quality standards for public transportation are available, they are not yet complete. The Hygienic Standards for Public Transport (GB9673-1996) and Hygienic Standards for Public Transport Waiting Rooms (GB9672-1996) were issued more than 20 years ago and have now been abolished. The 'Indoor Air Quality Standard (GB/T18883-2002)' is mainly aimed at the management of residential and office environments, and pays more attention to physical and chemical indicators, such as ozone indicators, which are different from the public transportation environment, so they are not fully applicable. In order to facilitate real-time monitoring of air quality in subway stations, we independently developed a multifunctional air quality sensor. Multifunctional air quality sensor (RS-MG111-N01-1) is an air environment multi-element sensor, using electrochemical and catalytic combustion sensor principles, can be used to detect temperature, humidity, PM2 in the air environment. 5. Various elements such as PM10, atmospheric pressure, light, TVOC, carbon monoxide, carbon dioxide, ozone, methane, oxygen, sulfur dioxide, nitrogen dioxide, hydrogen, hydrogen sulfide, ammonia, etc., basically cover various indicators reflecting air quality. During its use, the multifunctional air quality sensor can simultaneously monitor eleven environmental elements, including temperature, humidity, PM2.5, PM10, atmospheric pressure, light, TVOC, CO2, O3, etc. Choose at most eight elements out of ten environmental elements, and monitor them with three gases including CO, CH4, O2, SO2, NO2, H2, H2S, and NH3. The sensor adopts the original imported sensor and control chip, which has the characteristics of high precision, high resolution and good stability. Dual-frequency data acquisition and automatic locking technology, PM2.5 and PM10 are collected at the same time, the consistency can reach ±10%; the TVOC measuring unit adopts imported high-sensitivity gas detection head, the technology is mature, and the high-performance signal acquisition circuit is used. High stability and accuracy. High air pressure range, a wide range of 0-120Kpa air pressure range, can be applied to various altitudes. Depending on the mounting position of the base, two methods, wall-mounted and ceiling-mounted, can be used. Data transmission adopts 4G network transmission, which is convenient to connect. With the free monitoring platform software RS-RJ-K provided by our company or the free cloud platform provided by our company, it can directly form an online air environment integrated monitoring system. Users can log in to the cloud platform through a variety of methods such as computer web pages, mobile apps, and WeChat official accounts, and view the real-time data uploaded by the environmental monitoring host on the front-end interface. You can also view historical data in time periods and download Excel or PDF format. Historical data. Multifunctional air quality sensors can not only be used in subway stations, but also widely used in building HVAC, building energy conservation, smart homes, schools, hospitals, airport stations and other places.
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