7月全国平均气温23.6℃，气温为历史同期最高，气候显著偏暖，极端天气频发：48个国家站日最高气温突破历史极值，极端高温天气频发；共出现10次区域暴雨过程，其中华北和东北地区的较强降水过程累计降水量大、极端性强；台风生成数（7个）及登陆数（3个）均显著偏多，台风“韦帕”累积雨量大，“竹节草”登陆后长时间影响苏皖等地。 气象扩散条件显著影响大气污染物扩散，7月份空气质量如何？详见7月空气动态视频。

In June 2025, China's air quality reflected typical summer patterns, with high temperatures driving ozone formation and rainfall helping suppress pollution. In early June, northerly winds and thunderstorms improved air quality across northern China. However, widespread elevated ozone levels emerged in North China, the Huang-Huai region, and northern Yangtze River Delta due to persistent heat and sunshine, with pollution bands extending northward into the Beijing-Tianjin-Hebei region. Meanwhile, consistent rainfall kept air clean in the south. Mid-month, ozone exceeded standards for three consecutive days in Beijing-Tianjin-Hebei. Typhoon "Butterfly" brought heavy rainfall to South China, cleansing the air, but southerly winds pushed ozone levels back up in the Yangtze River Delta, Central Plains, and even the Chengdu Plain, where exceedances were also recorded. In late June, the northward shift of the rain belt ended the heatwave. While ozone remained elevated in Shanghai due to sustained heat, cloudy and rainy conditions effectively suppressed pollution across most of central and eastern China. However, ozone continued to spread from the Bohai Rim into the Northeast Plain.

In early May, cyclonic activity over western China and Mongolia triggered multiple waves of dust storms sweeping east and south, affecting Shaanxi, Gansu, Ningxia, Inner Mongolia, Hebei, and Henan. The storms further impacted the Guanzhong Plain, Hubei, Shanxi, Anhui, Zhejiang, and the Sichuan Basin, with light haze and dust pollution observed along the foothills of North China. By mid-May, rising temperatures increased ozone formation potential. Some monitoring sites in northern North China, the Yangtze River Delta, the Pearl River Delta, and the Chengdu-Chongqing region recorded early exceedances. Overall air quality remained good across central and eastern China, with only slightly elevated particulate levels in eastern Inner Mongolia. In late May, another round of dust storms hit Gansu, Ningxia, and southern Xinjiang, causing short-term moderate to heavy PM10 pollution. At the same time, persistent hot and humid weather fueled widespread light ozone pollution across sunny areas—from North China and the Beijing-Tianjin-Hebei region to central and southern Northeast China, northern Yangtze River Delta, and the Northeast Plain. Afternoon ozone spikes became frequent in North China. Fortunately, increased rainfall kept air quality in South China generally good, and intermittent northerly winds brought temporary improvements to the North.

In early April, dust storms from Northwest China moved eastward, elevating PM10 levels across regions including Shaanxi, Gansu, Ningxia, Shanxi, Hebei, Shandong, and Henan. Elevated particulate levels were also observed in Hubei, Hunan, Guangxi, and parts of the Yangtze River Delta. In mid-April, a rare and powerful wind event swept across central and eastern China, triggering widespread sandstorms in 23 provinces. PM10 levels surged dramatically in areas including Sichuan, Chongqing, Hunan, Hubei, Jiangxi, and the Yangtze River Delta (Jiangsu, Zhejiang, and Shanghai), with record-breaking pollution in some locations. Dust storms crossed the Nanling Mountains, causing heavy pollution in Guangdong and Guangxi, and even affecting Hainan. In late April, rainfall improved air quality across central and eastern China. However, new dust storms emerged in the northwest, impacting Ningxia, Inner Mongolia, and Shaanxi.

In early March, poor dispersion conditions in North China triggered heavy pollution alerts in nearly 30 cities. Beijing experienced prolonged pollution from March 8 to 11. By mid-to-late March, rare northwesterly warm winds improved air quality across the region. This month saw record-breaking warmth, with daily high temperatures at 712 weather stations nationwide exceeding historical averages. Notable highs included 30°C in Beijing’s Haidian District on March 22, 33.1°C in Shanghai’s Baoshan District on March 26, and 33.7°C in Hefei, Anhui Province, on the same day. However, a nationwide cold wave between March 25–30 brought a sharp temperature drop along with sandstorms, rain, and snow. Sandstorms were notably active this month, with four major events, including one severe sandstorm. The central and eastern regions saw repeated clashes between sand and smog.

In February, cold air improved overall air quality in northern China. Beijing’s monthly average PM2.5 concentration fell to 26 μg/m3, down 34% year-on-year. The Beijing-Tianjin-Hebei region and Fenwei Plain also saw notable improvements. In contrast, persistent northerly winds led to flat or higher PM2.5 levels in southern regions. As warm southerly winds returned, haze reappeared in parts of the north. While February saw year-on-year air quality improvement overall, regional differences remain significant, and meteorological conditions continue to influence outcomes—underscoring the need for sustained pollution control.