How many people in Paris are affected by their environment?

The question is too broad and it is impossible to provide a precise answer. According to the World Health Organization, air pollution is the single biggest environmental health risk. In 2016, an estimated 4.2 million deaths worldwide were attributed to ambient air pollution. In addition, the WHO estimates that 12.6 million deaths per year are due to the environment, including indoor air pollution, water pollution and chemical hazards.