Cardiovascular disease is the number one cause of death globally and air pollution can be a contributing cause. Acute myocardial infarction and cardiac arrest are frequent manifestations of coronary heart disease. The objectives of the study were to investigate the association between 4 657 out-of-hospital cardiac arrests (OHCA) and hourly and daily outdoor levels of PM10, PM2.5, coarse fraction of PM (PM10-2.5), ultrafine particle proxies, NOx, NO2, O3 and CO in Copenhagen, Denmark, for the period 2000–2010.

There has been discrepancies between the daily air quality reports of the Beijing municipal government, observations recorded at the U.S. Embassy in Beijing, and Beijing residents’ perceptions of air quality. This study estimates Beijing’s daily area PM2.5 mass concentration by means of a novel technique SPA (Single Point Areal Estimation) that uses data from the single PM2.5 observation station of the U.S Embassy and the 18 PM10 observation stations of the Beijing Municipal Environmental Protection Bureau.

In this study, size-segregated particulate matter samples were collected in Raipur, India from July 2009 to June 2010 by using eight-stage cascade impactor sampler. The annual average concentrations and associated standard deviation of PM10, PM2.5–10, PM2.5, and PM1 were 270.5 ± 105.5, 119.6 ± 44.6, 150.9 ± 78.6, and 72.5 ± 39.0 μg/m3, respectively. The PM10 and PM2.5 levels at Raipur, India were well above the annual National Ambient Air Quality Standards of India of 60 and 40 μg/m3 for PM10 and PM2.5, respectively.