When does smog occur? ——Hot spot analysis and data interpretation of the entire network in the past 10 days
As one of the core issues of environmental governance, haze has recently attracted public attention again. Combining hot topics and data analysis across the Internet in the past 10 days, this article will explore the causes of smog, peak periods and countermeasures, and provide structured data for reference.
1. Key factors in the formation of smog

According to monitoring by the Meteorological and Environmental Department, haze is usually triggered by the following conditions:
| factors | degree of influence | typical area |
|---|---|---|
| calm weather | ★★★★★ | North China Plain, Sichuan Basin |
| Pollutant emissions | ★★★★☆ | Industrial dense area |
| Heating in winter | ★★★☆☆ | northern city |
2. Hot smog events in the past 10 days
| Date | event | Hot search index |
|---|---|---|
| November 15 | Orange warning activated for Beijing, Tianjin and Hebei | 120 million |
| November 18 | Controversy over new energy vehicle traffic restriction policy | 89 million |
| November 22 | Sales of PM2.5 masks surge | 65 million |
3. Analysis of periods of high smog incidence
Through the compilation of data in the past three years, the haze shows obvious seasonal characteristics:
| month | average pollution days | primary pollutants |
|---|---|---|
| January | 18.7 days | PM2.5 |
| April | 9.2 days | Ozone |
| October | 14.5 days | PM10 |
4. Public Protection Suggestions
1.Travel protection:It is recommended to wear N95 mask when PM2.5 concentration is >150
2.Home protection:When using an air purifier, the filter element needs to be replaced regularly
3.Health monitoring:Sensitive groups should pay attention to AQI real-time data
5. Forecast of future trends
According to the forecast of the China Environmental Monitoring Center, December will usher in a new round of high-incidence periods of smog. The main affected areas include:
| area | Estimated number of days with pollution | peak concentration |
|---|---|---|
| Beijing-Tianjin-Hebei | 12-15 days | 180-220μg/m³ |
| Yangtze River Delta | 8-10 days | 150-180μg/m³ |
The data in this article is synthesized from the Ministry of Ecology and Environment, the China Meteorological Administration and the hot search lists of major social platforms. It uses structured presentation to help readers quickly grasp the haze dynamics. It is recommended that the public obtain real-time warning information through the "Air Quality Release" APP and scientifically respond to haze weather.
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