英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：


请选择你想看的字典辞典：
单词字典翻译
mists查看　mists　在百度字典中的解释百度英翻中〔查看〕
mists查看　mists　在Google字典中的解释Google英翻中〔查看〕
mists查看　mists　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Air pollution: The silent killer called PM2. 5 - Phys. org
    Among the different types of air pollution, PM2 5 kills the most people worldwide It consists of particles smaller than approximately 2 5 microns—so small that billions of them can fit
  • Infographic: What is fine particulate matter (PM2. 5)? - Canada
    Fine Particulate Matter (also known as PM 2 5) are particles in the air that measure less than 2 5 micrometers (μm) in diameter, and typically consists of a mix of things like smoke, soot, liquid or solid particles in aerosol, or biological matter like mould, bacteria, pollen and animal dander
  • What is PM2. 5 and Why You Should Care - Bliss Air
    PM2 5 refers to atmospheric particulate matter (PM) that have a diameter of less than 2 5 micrometers, which is about 3% the diameter of a human hair Commonly written as PM 2 5, particles in this category are so small that they can only be seen with a microscope
  • Understanding PM levels: What is considered unhealthy and why?
    Smaller particles, such as PM2 5, pose a greater risk as they can penetrate deep into the respiratory system and even enter the bloodstream, causing a range of adverse health effects PM levels are typically measured in micrograms per cubic meter (µg m3) of air
  • Air quality guideline - Wikipedia
    The guidelines stipulate that PM 2 5 should not exceed 5 μg m 3 annual mean, or 15 μg m 3 24-hour mean; and that PM 10 should not exceed 15 μg m 3 annual mean, or 45 μg m 3 24-hour mean [2] For ozone (O 3), the guidelines suggest values no higher than 100 μg m 3 for an 8-hour mean and 60 μg m 3 peak season mean [2]
  • Particulate Matter (PM) Basics | US EPA - U. S. Environmental Protection . . .
    Some particles less than 10 micrometers in diameter can get deep into your lungs and some may even get into your bloodstream Of these, particles less than 2 5 micrometers in diameter, also known as fine particles or PM 2 5, pose the greatest risk to health
  • Particulate matter (PM10 and PM2. 5) - NSW Health
    PM2 5 (particles with a diameter of 2 5 micrometres or less): these particles are so small they can get deep into the lungs and into the bloodstream There is sufficient evidence that exposure to PM2 5 over long periods (years) can cause adverse health effects
  • PM2. 5 Explained - Indoor Air Hygiene Institute
    Most studies indicate PM2 5 at or below 12 μg m 3 is considered healthy with little to no risk from exposure If the level goes to or above 35 μg m 3 during a 24-hour period, the air is considered unhealthy and can cause issues for people with existing breathing issues such as asthma
  • Canadian PM2. 5 Air Quality Interactive Map by PurpleAir
    Watch: With two minute updates, The Canadian PM2 5 layer is based on PM2 5 values with breakpoints matching the AQHI+ also used on the aqmap ca website Be sure to use hourly averages and the ECCC conversion on the PurpleAir map if you wish to compare the two maps
  • Air pollution – How to convert between mg m3, µg m3 and ppm, ppb
    When it comes to determining the concentration of air pollutants in the atmosphere, the units of measurement one would typically see are either mg m3, µg m3, ppm, or ppb





中文字典-英文字典  2005-2009