Background Air pollution and cardiovascular disease are increasing problems in China. However, the short-term association between fine particulate matter (PM 2.5 ) and cardiovascular disease (CVD) is not well documented. The purpose of this study is to estimate the short-term effects of PM 2.5 on CVD admissions in Beijing, China. Methods In total, 460,938 electronic hospitalization summary reports for CVD between 2013 and 2017 were obtained. A generalized additive model using a quasi-Poisson distribution was used to investigate the association between exposure to PM 2.5 and hospitalizations for total and cause-specific CVD, including coronary heart disease (CHD), atrial fibrillation (AF), and heart failure (HF) after controlling for the season, the day of the week, public holidays, and weather conditions. A stratified analysis was also conducted for age (18–64 and ≥ 65 years), sex and season. Results For every 10 μg/m 3 increase in the PM 2.5 concentration from the previous day to the current (lag 0–1) there was a significant increase in total CVD admissions (0.30, 95% CI: 0.20, 0.39%), with a strong association for older adults (aged ≥65 years), CHD (0.34, 95% CI: 0.22 to 0.45%) and AF (0.29, 95% CI, 0.03 to 0.55%). However, the observed increased risk was not statistically significant for HF hospitalizations. The associations in the single-pollutant models were robust to the inclusion of other pollutants in a two-pollutant model. No differences were found after stratification by sex and season. Conclusions Exposure to PM 2.5 increased the risk of hospitalizations from CVD, especially for CHD, and appeared to have more influence in the elderly. Precautions and protective measures and efforts to reduce exposure to PM 2.5 should be strengthened, especially for the elderly. Electronic supplementary material The online version of this article (10.1186/s12940-019-0506-2) contains supplementary material, which is available to authorized users.

Although exceptionalism is an important dimension of China’s foreign policy, it has not been a subject of serious scholarly research. This article attempts to identify manifestations of exceptionalism in China’s long history and explain why and how different types of exceptionalism have arisen in different historical periods. The analytical approach is both historical and theoretical. It explores how international structure has interacted with perceptions of history and culture to produce three distinctive yet related types of exceptionalism in imperial, Maoist, and contemporary China. While resting on an important factual basis, China’s exceptionalism is constructed by mixing facts with myths through selective use of the country’s vast historical and cultural experiences. The implications of contemporary China’s exceptionalism — as characterized by the claims of great power reformism, benevolent pacifism, and harmonious inclusions — are drawn out by a comparison with American exceptionalism. While American exceptionalism has both offensive and defensive faces, Chinese exceptionalism is in general more defensive and even vague. While not determinative, exceptionalism can suggest policy dispositions, and by being an essential part of China’s worldview, it can become an important source for policy ideas, offer the ingredients for the supposed construction of Chinese theories of international relations, and provide a lens through which to view emerging Chinese visions of international relations.

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