Traditional Culture Encyclopedia - Weather forecast - What are the three standard indexes of smog yellow, orange and red?
What are the three standard indexes of smog yellow, orange and red?
Level 1 (extremely heavy pollution), that is, the air quality index in this area has been above 500 for 24 consecutive hours.
Grade II (serious pollution), that is, the air quality index in this area for 48 hours is within the range of 30 1 to 500 (inclusive).
Grade III (heavy pollution), that is, the air quality index in this area for 72 hours is within the range of 20 1 to 300 (inclusive).
Haze weather is serious, so you need to take your own precautions. We can install a fresh air system at home. My home decoration is a five-degree and five-constant fresh air system, and it is also very comfortable in foggy days.
- Previous article:What are the interesting attractions in Da Nang, Vietnam?
- Next article:Sentences about sentimental lyrics
- Related articles
- Poems and famous sentences describing autumn
- A new cold air is coming. When will the weather really get warmer?
- Introduction of Canggu Town Tourist Attractions Picture Cangfang Ancient Town Tourist Attractions
- Which district does Hangzhou Chongxian belong to (which district is Hangzhou Chongxian Street)
- What are the five elements of the sea?
- 20 10 how many heavy rains occurred in south China?
- How do ants predict the weather?
- What is the idiom for sunny? What is the idiom for sunny?
- The weather in Beijing is really cold. It's a cold current from Siberia. What does this conversation mean?
- Science test questions and answers