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    atmosphere And exhaust gas / ambient air
  • ambient air
  • Indoor air
  • Lampblack of canteen
  • Oil and gas in oil storage depot and gas station
  • waste gas

    air pollution It usually refers to the phenomenon that some substance enters into the atmosphere due to human activities and natural processes, showing sufficient concentration and reaching enough time, thus endangering human comfort, health and welfare or endangering the environment.

     Ambient air detection

    With the rapid development of China's economy and society, coal based energy consumption has risen sharply, the number of motor vehicles has increased sharply, the emissions of nitrogen oxides (NOx) and volatile organic compounds (VOCs) have increased significantly in the economically developed areas, the pollution of ozone (O3) and fine particulate matter (PM2.5) has intensified, the haze phenomenon has occurred frequently, and the visibility has been reduced. Environmental pollution is becoming more and more serious in Japan, especially air pollution, which seriously affects people's physical and mental health, public safety and social stability.

    According to the survey Nowadays, air pollution is the main cause of premature death and health problems of human beings, especially children. Particulate pollution in the air can cause about 1.15 million deaths a year. Surface ozone can cause 700000 deaths from respiratory diseases every year, more than 75% of which occur in Asia. The impact of air pollution on human life is huge, so it is of great significance to carry out environmental air quality monitoring activities.

    In order to speed up the air pollution control in China and effectively protect the people's health, the Ministry of Environmental Protection approved and issued the new "ambient air quality standard" (GB 3095-2012) in 2012.

    Relevant standards

    Ambient air quality standard GB 3095-2012

    Test items

    Sulfur dioxide, nitrogen oxides, total suspended particulates (TSP), nitrogen dioxide, inhalable particles (PM10), inhalable particles (PM2.5), fluoride, lead, ozone, carbon monoxide

    Indoor environment quality It is closely related to people's health. People spend 80% of their life indoors. Studies have shown that indoor environmental pollution is several times higher than outdoor. In recent years, decoration pollution, which is harmful to health, has caused an increase in morbidity and mortality of the global population. The reason is that the building materials used in the newly built and rebuilt buildings contain harmful substances, which seriously exceed the standard. Poor construction quality will cause air pollution in the indoor environment. Children, pregnant women and chronic patients, because they stay indoors longer than other people, are more exposed to indoor air pollution, especially children, who are more vulnerable to indoor air pollution than adults. one side Children's body is growing and developing, and their breathing capacity is nearly 50% higher than that of adults, on the other hand Children spend 80% of their time indoors. The World Health Organization announced that 100000 people die of asthma every year because of indoor air pollution, and 35% of them are children. The prevalence of asthma in children in China is 2% - 5%, and 85% of them are under the age of 5.

     Indoor air detection

    From the current detection and analysis Of indoor air pollutants Main sources There are the following aspects: building and interior decoration materials, outdoor pollutants, combustion products and human activities. Among them, the pollution of indoor decoration materials and furniture is the main aspect of indoor air pollution.

    The national Department of health, construction and environmental protection once conducted a spot check on interior decoration materials. The results showed that 68% of the indoor decoration materials were contaminated by poisonous gases, and these decorative materials would emit more than 300 volatile organic compounds. Among them, formaldehyde, ammonia, benzene, toluene, xylene, volatile organic compounds and radioactive gas radon can cause headache, nausea and vomiting, convulsions, dyspnea, etc. repeated contact can cause allergic reactions, such as asthma, allergic rhinitis and dermatitis, Long term exposure can lead to cancer (lung cancer, leukemia) or abortion, fetal malformation and growth retardation. Therefore, only by accurately evaluating the quality level of indoor environment and optimizing the indoor environment can the broad masses of people truly live and work in peace and contentment.

    Service scope:

    Undertake the social commission test, and carry out indoor environmental detection for indoor pollution after decoration

    Undertake the indoor air quality inspection of civil construction project completion acceptance

    Provide consulting services on indoor environmental protection, indoor environmental testing and decoration pollution

    Test items

    Code for indoor environmental pollution control of civil building engineering (GB 50325-2010): formaldehyde, benzene series, TVOC, radon, ammonia;

    Indoor air quality standard (GB / T 18883-2002): formaldehyde, toluene, benzene, relative humidity, temperature, xylene, TVOC, carbon monoxide, ammonia, radon, sulfur dioxide, nitrogen dioxide, etc.

    1. Lampblack of canteen

    The cooking fumes emitted by our cooking are a large number of thermal oxidative decomposition products of edible oil and food under high temperature conditions. When cooking, the oil is heated. When the temperature reaches 170 ℃ of the cooking oil's smoke point, blue smoke will appear at the initial stage. With the temperature rising, the decomposition speed will be accelerated. When the temperature reaches 250 ℃, there will be a large amount of oil smoke with pungent smell. The particle size of oil fume is 0.01-0.3 μ M.

     Detection of lampblack in canteen

    2. Lampblack pollutants

    More than 220 kinds of chemical substances, including aldehydes, ketones, hydrocarbons, fatty acids, alcohols, aromatic compounds, esters, lactones, heterocyclic compounds and so on, were detected from the cooking fume samples collected from the residents' families. Some known mutagenic carcinogens such as volatile nitrosamines were also found in cooking oil fume.

    3. Canteen oil smoke monitoring project

    Maximum allowable emission concentration

    Minimum removal efficiency of purification facilities

    4. The scale division of catering industry units

    scale small-scale medium-sized large
    Number of reference stoves ≥ 1,<3 ≥3,< 6 ≥6
    Total power of corresponding stove 1.67,< 5.00 ≥5.00,<10 ≥10
    Corresponding to the surface of exhaust hood
    Total projected area (M2)
    ≥1.1,< 3.3  ≥3.3,<6.6 ≥6.6


    5. Maximum allowable emission concentration of cooking fume and minimum removal efficiency of fume purification facilities in catering industry

    scale small-scale medium-sized large
    Maximum allowable emission concentration (mg / m3) two
    Minimum removal efficiency of purification facilities sixty seventy-five eighty-five

    as everyone knows, Gasoline is volatile The volatile organic compounds (VOCs) such as hydrocarbons, which are emitted into the air during the unloading and refueling process of gas stations, will cause health damage to gas station employees, drivers and surrounding residents. However, when oil and gas gather to a certain concentration, it is very easy to cause explosion or fire accident when encountering fire. At the same time, under the action of solar ultraviolet, oil and gas will react with nitrogen oxides in the atmosphere to form ozone and fine particles, and generate toxic photochemical smog, which is one of the important reasons for the increase of PM2.5 pollution source in the air and the formation of haze weather.

     Oil and gas detection of oil storage depot and gas station

    along with Rapid growth of vehicle ownership in Shaanxi Province Gasoline consumption is also increasing rapidly. At present, there are more than 3110 gas stations, more than 70 oil depots, and about 1400 oil tankers in Shaanxi Province. The annual consumption of gasoline is more than 2.5 million tons, including about 1.75 million tons in Guanzhong area. Gasoline is highly volatile, and more than 19000 tons of oil and gas (VOCs, composed of a variety of hydrocarbons, some of which have carcinogenic effects) are discharged into the atmosphere every year. These VOCs emitted into the atmosphere greatly improve the activity of the atmosphere. Most of them are precursors of PM2.5. They also easily lead to photochemical reactions between nitrogen oxides and produce photochemical smog, which seriously endangers human health and ecological safety. To this end, Shaanxi environmental protection department, provincial public security department, provincial finance department, provincial transportation department, Provincial Department of Commerce, Provincial Quality Supervision Bureau and other six departments jointly formulated and issued Work plan for comprehensive treatment of oil and gas recovery in Shaanxi Province (SHF [2013] No. 93) The comprehensive treatment work of oil and gas recovery in gas stations, oil storage depots and oil tank trucks has been started in an all-round way. In February 2014, Shaanxi environmental protection department issued the notice on acceptance and testing of oil and gas recovery and treatment project (Shh [2014] No. 140). The acceptance and inspection of oil and gas transformation of gas stations are further clarified.

    Relevant standards

    ■ emission standard of air pollutants for oil storage (GB 20950-2007)

    ■ emission standard of air pollutants for gas stations (GB 20952-2007)

    (HJ / T 431-2008)

    Test items

    Gas station oil and gas emissions: gas liquid ratio, tightness, liquid resistance detection, oil and gas concentration detection

    Oil depot detection: oil and gas concentration detection

    1. Brief introduction of industrial waste gas

    Air pollution is one of the most prominent environmental problems in China. Industrial waste gas is an important source of air pollutants. A large number of industrial waste gas discharged into the atmosphere will inevitably reduce the quality of the atmospheric environment, bring serious harm to human health, and cause huge losses to the national economy. Harmful substances in industrial waste gas enter human body through respiratory tract and skin, which can cause temporary and permanent lesions to human respiratory, blood, liver and other systems and organs, especially benzopyrene polycyclic aromatic hydrocarbons (PAHs) can directly cause cancer in human body, which has attracted great attention of human beings.

     Air exhaust detection

    2. Types of pollutants

    Industrial waste gas includes organic waste gas and inorganic waste gas. Organic waste gas mainly includes various hydrocarbons, alcohols, aldehydes, acids, ketones and amines; inorganic waste gas mainly includes sulfur oxides, nitrogen oxides, carbon oxides, halogens and their compounds. According to the exhaust air volume, temperature, concentration and its own chemical and physical properties, the treatment methods of industrial waste gas are different.

    3. Industrial waste gas monitoring project

    Temperature, relative humidity, air flow rate, total suspended particles

    Boiler dust, industrial furnace dust, lingman blackness, inhalable particles

    Ammonia, fluoride, hydrogen chloride, sulfuric acid mist, chromic acid mist, nitric oxide, nitrogen dioxide, nitrogen oxide, ozone, sulfur dioxide, hydrogen sulfide, chlorine, hydrogen chloride, total suspended particulates, PM10 and PM2.5, phenolic compounds, lampblack, aniline, formaldehyde, benzene series, benzene, toluene, xylene, total volatile organic compounds (TVOC), non methane total hydrocarbons, total hydrocarbons

    ? hexavalent chromium, arsenic, lead, cadmium, nickel

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