Novel coronavirus's basic common sense
Refer to the Public Protection Guide for Infected Pneumonia in novel coronavirus compiled by the Disease Prevention and Control Bureau of the National Health and Wellness Committee and the Center for Disease Control and Prevention of China: novel coronavirus belongs to β novel coronavirus, with capsule, round or oval particles, often polymorphic, with a diameter of 60 ~140 nm (1nm = 0.001? m； Nm: nanometer,? M: micron).
According to the "Diagnosis and Treatment Plan for Infected Pneumonia in novel coronavirus (Trial Fifth Edition)" published by National Health Commission website, the description of the transmission route of the virus is that "droplets are mainly transmitted through respiratory tract and contact." Therefore, car door handles, steering wheels, car interiors and other parts are more likely to contact and spread.
What kind of filter can filter viruses?
Air conditioning filter element is an important part of air conditioning system. When air enters the car through the fan, the air conditioner filter element will filter out pollutants in the air, such as tail gas, dust, powder, bacteria and particles. , thus providing clean and refreshing air for the car and protecting the health of the occupants in the car. So in this epidemic, what kind of air conditioning filter can filter novel coronavirus?
HEPA (High Efficient Particulate Air Filter), which means high efficiency air filter in Chinese, is the highest level air conditioning filter element at present, which can meet the HEPA standard. For 0. 1 micron and 0.3 micron, the efficiency of HEPA net is 99.7%. The characteristic of HEPA net is that air can pass through, but particles cannot. Particles with a diameter greater than 0.3 micron (1/200 of the hair diameter) can be removed, and the removal efficiency is greater than 99.97%. It is the most effective filter medium for pollutants such as smoke, dust and bacteria.
According to the "novel coronavirus Vehicle Prevention and Control Suggestions" recently issued by the National Engineering Laboratory of Electric Vehicles of Beijing Institute of Technology, some vehicles are directly equipped with HEPA filter elements, and the filtering effect of PM2.5 particles is similar to that of N95 masks. HEPA air conditioning filter element has a blocking efficiency of 99.97% for particles with a diameter of 0.3 micron or more, while the diameter of droplets formed by sneezing and coughing is generally greater than 0.74 micron, so HEPA has the function of filtering droplets attached to COVID-19. HEPA filter element needs to be replaced in time, otherwise the filtering effect may be lost.
Although HEPA is the highest level air conditioning filter at present, not all HEPA filters can intercept viruses. Only when the grade reaches E 1 1 can it have the same effect as N95 mask.
Can an air purifier effectively filter viruses?
Vehicle-mounted purifier usually consists of high voltage generating circuit, negative ion generator, micro fan, air filter and other systems. Its working principle is: the micro fan (also called ventilator) in the machine circulates the air inside the car, and the polluted air passes through the PM2.5 filter screen and activated carbon filter element in the machine to filter or adsorb various pollutants, and then passes through the negative ion generator installed at the air outlet (the internal high voltage of the negative ion generator generates DC negative high voltage when it works), which continuously ionizes the air and generates a large number of negative ions, which are sent out by the micro fan to form negative ion airflow. Negative oxygen ions can adsorb impurities in the air and promote particulate matter.
The air purifier can prevent some particles such as viruses and dust from entering the car to a certain extent. However, we should note that the mode of transmission in novel coronavirus is more droplet transmission. When we cough, sneeze or even talk, droplets will be ejected from our nose and mouth, so it is impossible to completely block the virus by filtering harmful substances only by car air purifier.
How to prevent private cars?
Recently, China CDC gave the following suggestions on the protection of private cars during the epidemic: keep ventilation in open places; In a closed environment, close the doors and windows and open the internal circulation of the air conditioner at the same time. However, when opening windows for ventilation in winter, attention should be paid to prevent unnecessary situations such as colds caused by large temperature difference between inside and outside the car.
When drivers and passengers enter public places and return to vehicles, it is recommended to use hand disinfectant for hand hygiene first. After getting on the bus, relatives and friends (with unknown health status) should open the window in time to ventilate and disinfect the surface of related items in the car. You can choose a legal and effective disinfectant or disinfectant wipes to wipe and disinfect.
The surface of the object can be wiped with chlorine-containing disinfectants, chlorine dioxide and other disinfectants or disinfectant wipes. It is suggested to choose effective hand and skin disinfectants, such as iodophor, chlorine-containing disinfectant or hydrogen peroxide disinfectant, or quick-drying hand disinfectant for wiping disinfection.
What preventive measures should private cars take when they have suspicious symptoms?
China CDC recommends that people with suspicious symptoms (including fever, cough, sore throat, chest tightness, dyspnea, fatigue, nausea and vomiting, diarrhea, conjunctivitis, muscle aches, etc. ) Wear a medical surgical mask when riding in a private car and try to keep a distance from the passengers in the same car. At the same time, don't turn on the internal circulation of air conditioner, and open the window for ventilation. All members of the car need to wear masks that meet the standards.
When people with suspicious symptoms get off the bus, quickly open the window for ventilation and disinfect the surfaces (door handle, steering wheel, window, windshield, seat, etc.). ) they contact.
When the patient gets off the bus, he should disinfect the terminal of the private car in time. The disinfection scope of private car terminal includes: object surface (seat, steering wheel, window, handlebar, etc. ), air conditioning system and vomit, etc. Peroxyacetic acid and chlorine dioxide are recommended as disinfectants.
When disinfection is carried out, the car should be started first and the internal circulation of the air conditioner should be started. The specific disinfection method is operated by professionals of local disease control institutions or qualified third parties. It is not recommended to use vehicles before disinfection. Other passengers are close contacts, so medical observation 14 days should be carried out (refer to the home medical observation of close contacts).
Conclusion:
For this epidemic, it is more important to nip in the bud. After understanding the above measures, we still want to remind you to keep your hands clean at any time and disinfect them when you get home. There are also people who don't go to crowded places, don't eat dinner, don't eat cold, wear masks to travel, face the epidemic, be calm, don't spread rumors, believe in the effective control of the government, and survive the extraordinary period of the epidemic safely.
This article comes from China Net Auto.