Ground level ozone is a highly reactive gas commonly found in urban and suburban environments formed when pollutants react in sunlight. The findings published in the journal The BMJ based on data from over 400 cities in 20 countries across the world - show that more than 6000 deaths each year would have been avoided in the selected cities if countries had implemented stricter air quality standards. These findings have important implications for the design of future public health actions; particularly for example in relation to the implementation of mitigation strategies to reduce the impacts of climate change said researchers