According to the World Health Organization, air pollution is the leading cause of death worldwide, responsible for an estimated 7 million premature deaths each year.

The main sources of air pollution include motor vehicles, industrial activities, power plants, and residential heating and cooking.

Particulate matter, especially fine particulate matter (PM2.5), is the air pollutant most strongly linked to premature death. PM2.5 can penetrate deep into the lungs and cause inflammation and other health problems.

Air pollution can contribute to premature death by causing heart attacks and strokes, aggravating asthma and other respiratory diseases, and increasing the risk of cancer.

Children, older adults, and people with heart or lung disease are all more vulnerable to the effects of air pollution.

Reducing our reliance on fossil fuels, investing in renewable energy sources, and improving energy efficiency can all help to reduce air pollution and premature death.

The Clean Air Act is a law passed in the United States in 1970 to regulate air pollution.

The National Ambient Air Quality Standards (NAAQS) are air quality standards set by the United States Environmental Protection Agency (EPA) to protect public health.

The World Health Organization's (WHO) Air Quality Guidelines are air quality guidelines set by the WHO to protect public health.

The WHO Air Quality Guidelines are generally more stringent than the NAAQS, meaning that they set lower limits for air pollution concentrations.

Reducing air pollution can lead to a number of health benefits, including reduced risk of heart attacks and strokes, reduced risk of asthma and other respiratory diseases, and reduced risk of cancer.

Reducing air pollution can lead to a number of economic benefits, including increased productivity, reduced healthcare costs, and increased tourism.

There are a number of challenges to reducing air pollution, including the cost of reducing air pollution, the political will to reduce air pollution, and the lack of public awareness about the dangers of air pollution.

There are a number of things you can do to reduce air pollution, including driving less, using public transportation or walking more, and reducing your energy consumption.

It is difficult to predict the future of air quality, as it will depend on a number of factors, including the success of efforts to reduce air pollution, the growth of the global economy, and the impacts of climate change.