Weather Summary - On October 4th, Suzhou experienced light rain in the southern region, with localized hourly rainfall being significant [1] - The minimum temperature recorded in the morning was 22.7℃, while the maximum temperature reached 28.5℃ by 4 PM, with increased humidity making it feel muggy [1] - A cold front is expected to bring noticeable cooling to most northern regions of China after the holiday, with maximum temperatures in North China dropping below 15℃, indicating a more pronounced autumn chill [1] - In contrast, southern regions will continue to experience high temperatures, particularly in central and eastern Jiangnan and northern South China [1] - Typhoon "Maidum" is approaching, leading to significant wind and rain impacts in areas from South China to Yunnan [1] Future Weather Forecast - The Suzhou Meteorological Station predicts cloudy conditions with occasional overcast skies on the night of October 4th [1] - On October 5th, the weather will remain cloudy with an east wind of 3-4 levels, and the morning minimum temperature is expected to be around 25℃, with a daytime maximum of approximately 33℃ [1] - UV radiation intensity is moderate, and precautions for sun protection are advised [1] - The weather on October 6th is also expected to be predominantly cloudy, with temperatures ranging from 26℃ to 34℃ [1] - Air quality in Suzhou is forecasted to be "excellent" from the night of October 4th to the morning of October 5th, transitioning to "good" by the afternoon of October 5th [1]

Core Viewpoint - The Ministry of Ecology and Environment forecasts that the overall air quality in most parts of the country will be good in the first half of October, influenced by precipitation and cold air, with localized mild pollution possible [1] Summary by Relevant Sections - **Air Quality Forecast** - The air quality in the majority of the country is expected to be predominantly good, with localized areas potentially experiencing mild pollution [1] - **Pollutants** - The primary pollutants identified are O3 (ozone) and PM2.5 [1] - **Regional Impacts** - Areas affected by dust storms, including Gansu's Hexi region, Ningxia, Qinghai, and western Inner Mongolia, may experience mild pollution, while southern Xinjiang could see moderate pollution [1]

Core Insights - The Ministry of Ecology and Environment reported that the average PM2.5 concentration in 339 cities was 14.5 micrograms per cubic meter in July, representing an 8.2% year-on-year decrease [1] - The average number of days with good air quality was 93.0%, an increase of 1.0 percentage points year-on-year [1] Group 1: National Air Quality - PM2.5 average concentration in 339 cities: 14.5 micrograms per cubic meter, down 8.2% year-on-year [1] - PM10 average concentration: 28 micrograms per cubic meter, down 3.4% year-on-year [1] - Average days with good air quality: 93.0%, up 1.0 percentage points year-on-year [1] - Average days with severe pollution: 0.2%, down 0.1 percentage points year-on-year [1] Group 2: Regional Air Quality - Beijing-Tianjin-Hebei region PM2.5 average concentration: 18.3 micrograms per cubic meter, down 21.1% year-on-year [1] - Average days with good air quality in this region: 75.7%, down 4.6 percentage points year-on-year [1] - Beijing's PM2.5 concentration: 18.3 micrograms per cubic meter, down 31.2% year-on-year [1] - Average days with good air quality in Beijing: 83.9%, up 16.2 percentage points year-on-year [1] Group 3: Yangtze River Delta and Fenwei Plain - Yangtze River Delta PM2.5 average concentration: 14.6 micrograms per cubic meter, down 3.9% year-on-year [1] - Average days with good air quality in the Yangtze River Delta: 87.8%, down 5.9 percentage points year-on-year [1] - Fenwei Plain PM2.5 average concentration: 18.5 micrograms per cubic meter, down 20.6% year-on-year [1] - Average days with good air quality in the Fenwei Plain: 82.1%, up 14.1 percentage points year-on-year [1]

Core Insights - The average PM2.5 concentration in 339 cities in July was 14.5 micrograms per cubic meter, representing an 8.2% year-on-year decrease [1] - The average PM10 concentration was 28 micrograms per cubic meter, down 3.4% year-on-year [1] - The proportion of days with good air quality was 93.0%, an increase of 1.0 percentage points year-on-year [1] - The proportion of days with heavy pollution or worse was 0.2%, a decrease of 0.1 percentage points year-on-year [1] Regional Analysis - In the Beijing-Tianjin-Hebei region, the average PM2.5 concentration was 18.3 micrograms per cubic meter, down 21.1% year-on-year, with no days of heavy pollution reported [1] - The PM2.5 concentration in Beijing specifically was 18.3 micrograms per cubic meter, reflecting a 31.2% year-on-year decrease [1] - In the Yangtze River Delta region, the average PM2.5 concentration was 14.6 micrograms per cubic meter, down 3.9% year-on-year, with no days of heavy pollution [1] - In the Fenwei Plain region, the average PM2.5 concentration was 18.5 micrograms per cubic meter, down 20.6% year-on-year, with an 82.1% good air quality day ratio, up 14.1 percentage points year-on-year [1] City Rankings - Among 168 key cities, the top 20 cities with the best air quality included Huangshan, Haikou, Lishui, and Fuzhou [2] - The bottom 20 cities with the poorest air quality included Yangquan, Jiaozuo, and Luliang [2]

Group 1 - The average proportion of days with good air quality in China's cities at the prefecture level and above was 93.0% in July, an increase of 1.0 percentage points year-on-year [1] - The average concentration of PM2.5 in July was 14.5 micrograms per cubic meter, a decrease of 8.2% year-on-year, while the average concentration of PM10 was 28 micrograms per cubic meter, down 3.4% year-on-year [1] - The proportion of days with heavy pollution or worse was 0.2%, a decrease of 0.1 percentage points year-on-year [1] Group 2 - In the Beijing-Tianjin-Hebei region and surrounding areas, the average PM2.5 concentration was 18.3 micrograms per cubic meter, a decrease of 21.1% year-on-year, with an average good air quality days proportion of 75.7%, down 4.6 percentage points year-on-year [1] - The PM2.5 concentration in Beijing was 18.3 micrograms per cubic meter, a decrease of 31.2% year-on-year [1] - In the Fenwei Plain, the average PM2.5 concentration was 18.5 micrograms per cubic meter, a decrease of 20.6% year-on-year, with an average good air quality days proportion of 82.1%, an increase of 14.1 percentage points year-on-year [1] Group 3 - Among 168 key cities, the top 20 cities with the best air quality included Huangshan, Haikou, Lishui, and Fuzhou [2] - The bottom 20 cities with the worst air quality included Yangquan, Jiaozuo, and Luliang [2]

Group 1 - The average PM2.5 concentration in 339 cities was 14.5 micrograms per cubic meter in July, showing a year-on-year decrease of 8.2% [1] - The average PM10 concentration was 28 micrograms per cubic meter, down 3.4% year-on-year [1] - The average O3 concentration increased to 138 micrograms per cubic meter, reflecting a year-on-year rise of 4.5% [1] - The average SO2 concentration was 6 micrograms per cubic meter, with a year-on-year decrease of 14.3% [1] - The average NO2 concentration was 11 micrograms per cubic meter, down 8.3% year-on-year [1] - The average CO concentration was 0.6 milligrams per cubic meter, showing a year-on-year decrease of 14.3% [1] - The proportion of days with good air quality was 93.0%, an increase of 1.0 percentage points year-on-year [1] - The proportion of days with heavy pollution was 0.2%, a decrease of 0.1 percentage points year-on-year [1] - The average number of days exceeding standards due to dust storms was 0.6%, with heavy pollution days at 0.2% [1] Group 2 - Among 168 key cities, the top 20 cities with the best air quality included Huangshan, Haikou, and Lishui [2] - The bottom 20 cities with the worst air quality included Yangquan, Jiaozuo, and Luliang [2] - The top 20 cities with the lowest PM2.5 concentrations included Lishui, Zhoushan, and Dazhou [2] - The bottom 20 cities with the highest PM2.5 concentrations included Hebi, Tangshan, and Suizhou [2]

Core Insights - The Ministry of Ecology and Environment reported that in July 2025, the average proportion of days with good air quality across 339 cities was 93.0%, an increase of 1.0 percentage points year-on-year [1] - The proportion of days with heavy pollution or worse was 0.2%, a decrease of 0.1 percentage points compared to the previous year [1] - The average number of days exceeding air quality standards due to sandstorms was 0.6%, with heavy pollution days accounting for 0.2% of this total [1]

Air Quality Overview - In June, the average PM2.5 concentration across 339 cities was 16.3 µg/m³, a year-on-year decrease of 4.7% [2] - The average PM10 concentration was 33 µg/m³, down 5.7% year-on-year [2] - The average O3 concentration was 153 µg/m³, an increase of 0.7% year-on-year [2] - The proportion of days with good air quality was 84.0%, up 5.7 percentage points year-on-year [2] - The proportion of days with heavy pollution was 0.2%, unchanged year-on-year [2] Year-to-Date Air Quality - From January to June, the average PM2.5 concentration was 32.1 µg/m³, a decrease of 2.4% year-on-year [2] - The average PM10 concentration remained stable at 55 µg/m³ [2] - The average NO2 concentration was 20 µg/m³, down 4.8% year-on-year [2] - The average CO concentration was 1.0 mg/m³, a decrease of 9.1% year-on-year [2][3] Key Regions Analysis Beijing-Tianjin-Hebei Region - In June, the average PM2.5 concentration was 24.2 µg/m³, down 11.7% year-on-year [7] - The average O3 concentration was 213 µg/m³, a decrease of 3.6% year-on-year [7] - The proportion of good air quality days was 46.5%, an increase of 26.9 percentage points year-on-year [7] Yangtze River Delta Region - In June, the average PM2.5 concentration was 18.1 µg/m³, down 10.8% year-on-year [9] - The average O3 concentration was 176 µg/m³, a decrease of 11.6% year-on-year [9] - The proportion of good air quality days was 76.0%, an increase of 15.7 percentage points year-on-year [9] Fenwei Plain - In June, the average PM2.5 concentration was 20.4 µg/m³, down 17.4% year-on-year [11] - The average O3 concentration was 197 µg/m³, a decrease of 3.9% year-on-year [11] - The proportion of good air quality days was 49.2%, an increase of 15.3 percentage points year-on-year [11] Key Cities Performance - Among 168 key cities, the top 20 cities with the best air quality included Lhasa, Haikou, and Zhangjiakou [12] - The bottom 20 cities with the poorest air quality included Xianyang, Xi'an, and Kaifeng [12] - The cities with the most significant improvement in air quality included Xinzhou, Hohhot, and Baotou [12][13]

Core Viewpoint - The overall air quality in China for the second half of June is expected to be predominantly good, with some regions experiencing moderate pollution due to high temperatures and dust storms [1][2]. Group 1: National Air Quality Forecast - The air diffusion and wet removal conditions across the country are generally favorable, leading to good air quality in most areas [1]. - The Beijing-Tianjin-Hebei region and surrounding areas may experience light to moderate pollution due to high temperatures, particularly from June 17 to 30 [1]. - Dust storms may cause moderate or higher pollution levels in eastern and southern Xinjiang during certain periods [1]. Group 2: Beijing Air Quality Forecast - In Beijing, the air quality is expected to be good for most of the second half of June, with some periods of light ozone pollution [2]. - From June 18 to 25, average diffusion conditions are expected, leading to light pollution from ozone [2]. - The primary pollutant in Beijing during this period is expected to be ozone (O3) [2].

Group 1 - The average proportion of days with good air quality in 339 cities in China was 83.1% in April, a year-on-year decrease of 6.7 percentage points [1] - From January to April, there were 2060 days of sandstorm exceedance, an increase of 497 days compared to the previous year [1] - The main reasons for the increased sandstorm frequency include reduced precipitation, higher temperatures, and strong winds [1] Group 2 - The average concentration of PM10 in April was 56 micrograms per cubic meter, a year-on-year increase of 5.7% [1] - The proportion of days with severe pollution was 2.1% in April, an increase of 0.9 percentage points year-on-year [1] - It is expected that after June, the risk of sandstorms will significantly decrease due to increased rainfall and vegetation growth [2]