Pollution levels are worsening in India as it tries to industrialize, but “the idea that policy making should be led by government is lacking,” Bhargav Krishna, manager for environmental health at the Public Health Foundation of India, a health policy research center in New Delhi, said in an interview.

As air pollution worsened in parts of the world, including South Asia, it improved in the United States and Europe, the report said, crediting policies to curb emissions, among other things. The report’s website that provides country-by-country data on pollution levels and the health and mortality effects.

Environmental regulations in the United States and actions by the European Commission have led to substantial progress in reducing fine particulate pollution since 1990, the report said. The United States has experienced a reduction of about 27 percent in the average annual exposure to fine particulate matter, with smaller declines in Europe. Yet, some 88,000 Americans and 258,000 Europeans still face increased risks of premature death because of particulate levels today, the report said.

A fraction of the width of a human hair, these particles can be released from vehicles, particularly those with diesel engines, and by industry, as well as from natural sources like dust. They enter the bloodstream through the lungs, worsening cardiac disease and increasing the risk of stroke and heart failure, in addition to causing severe respiratory problems, like asthma and pneumonia.