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The World Health Organization guidelines were most recently updated in 2021. [1] The guidelines offer guidance about these air pollutants: particulate matter (PM), ozone (O 3), nitrogen dioxide (NO 2), sulfur dioxide (SO 2) and carbon monoxide (CO). [2] The WHO first released the air quality guidelines in 1987, then updated them in 1997. [2]
The EPA reviewed this NAAQS in 1985 and 1996, and in both cases concluded that the existing standard was sufficient. The most recent review by the EPA occurred in 2010, resulting in a new 1-hour NO 2 primary standard set at 100 ppb; the annual average of 0.053 ppm remained the same. Also considered was a new 1-hour secondary standard of 100 ppb.
For example, the United States Clean Air Act identifies ozone, particulate matter, carbon monoxide, nitrogen oxides (NO x), sulfur dioxide (SO 2), and lead (Pb) as "criteria" pollutants requiring nationwide regulation. [1] EPA has also identified over 180 compounds it has classified as "hazardous" pollutants requiring strict control. [2]
The 2024 Global Burden of Disease Study estimates that air pollution contributed to 8.1 million deaths in 2021, which is more than 1 in 8 deaths. Outdoor particulate pollution was the largest cause of death (4.7 million), followed by indoor air pollution (3.1 million) and ozone (0.5 million). [5]
The Air (Prevention and Control of Pollution) Act, 1981 is an Act of the Parliament of India to prevent air pollution in India. [ 1 ] [ 2 ] The law was amended in 1987. [ 3 ] This was the first attempt by the Government of India to combat air pollution .
An air quality index (AQI) is an indicator developed by government agencies [1] to communicate to the public how polluted the air currently is or how polluted it is forecast to become. [2] [3] As air pollution levels rise, so does the AQI, along with the associated public health risk. Children, the elderly and individuals with respiratory or ...
At the heart of teams' hesitance to sign Bregman were his age and a down year in 2024, with even more concerning peripherals. Due to a six-year, $100 million extension he signed in 2019, Bregman ...
A 2010 analysis estimated that 1.2 million people died prematurely each year in China alone because of air pollution. [48] China's high smog levels can damage the human body and cause various diseases. [49] In 2019, air pollution caused 1.67 million deaths in India (17.8% of total deaths nationally). [50]