Air pollution in the Indian capital of Delhi has reached extraordinarily high levels, equivalent to smoking two packs of cigarettes a day, the nation’s doctors and public health experts warned this week.

A new systematic synthesis by researchers at the University of Hawai?i at M?noa shows that there are at least 27 different physiological pathways in which a heatwave can kill a human being, and everyone is at risk.

“Due to the current void in national leadership on the issue of climate change, efforts at the state and local level are more important than ever,” says Eri Saikawa, an assistant professor of Environmental Sciences.

Limiting global warming below the critical 2C level set out in the Paris Agreement is both feasible and consistent with economic growth – and the knock-on improvements to air quality could already cover the costs of mitigation measures and save more than 300,000 lives annually by 2030.

Greenhouse gas emissions caused by urban households’ purchases of goods and services from beyond city limits are much bigger than previously thought. These upstream emissions may occur anywhere in the world and are roughly equal in size to the total emissions originating from a city’s own territory, a new study shows. This is not bad news but in fact offers local policy-makers more leverage to tackle climate change, the authors argue in view of the UN climate summit COP23 that just started. They calculated the first internationally comparable greenhouse gas footprints for four cities from developed and developing countries: Berlin, New York, Mexico City, and Delhi. Contrary to common beliefs, not consumer goods like computers or sneakers that people buy are most relevant, but housing and transport – sectors that cities can substantially govern.

oving bus stops away from intersections would substantially reduce the amount of pollution bus riders are exposed to, UCLA scientists report today in the journal Environmental Pollution.

Research has shown that in many cities in the United States and internationally, bus riders frequently spend 15 to 25 minutes or more each way waiting for a bus.

New research presented today at APHA’s 2017 Annual Meeting and Expo examined the burden of air pollution and its association with mortality in Chinese cities. The study by researchers at Drexel University Dornsife School of Public Health showed a significant correlation between higher air quality index concentrations and higher mortality rates. The study is the first to provide strong evidence of the burden of air pollution in major Chinese cities, as well as the impacts of air quality and climate change on urban population mortality.

Can environmental toxins disrupt circadian rhythms – the biological “clock” whose disturbance is linked to chronic inflammation and a host of human disorders? Research showing a link between circadian disruption and plankton that have adapted to road salt pollution puts the question squarely on the table.

A new optical device at Sandia National Laboratories that helps researchers image pollutants in combusting fuel sprays might lead to clearer skies in the future.

Researchers have shown free radical concentrations in lichens to be directly related to air pollution.