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Air quality index

About: Air quality index is a research topic. Over the lifetime, 26559 publications have been published within this topic receiving 473906 citations. The topic is also known as: AQI.


Papers
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Journal ArticleDOI
TL;DR: The evidence for adverse effects on health of selected air pollutants is discussed, and it is unclear whether a threshold concentration exists for particulate matter and ozone below which no effect on health is likely.

4,010 citations

Journal ArticleDOI
17 Sep 2015-Nature
TL;DR: It is found that emissions from residential energy use such as heating and cooking, prevalent in India and China, have the largest impact on premature mortality globally, being even more dominant if carbonaceous particles are assumed to be most toxic.
Abstract: Assessment of the global burden of disease is based on epidemiological cohort studies that connect premature mortality to a wide range of causes, including the long-term health impacts of ozone and fine particulate matter with a diameter smaller than 2.5 micrometres (PM2.5). It has proved difficult to quantify premature mortality related to air pollution, notably in regions where air quality is not monitored, and also because the toxicity of particles from various sources may vary. Here we use a global atmospheric chemistry model to investigate the link between premature mortality and seven emission source categories in urban and rural environments. In accord with the global burden of disease for 2010 (ref. 5), we calculate that outdoor air pollution, mostly by PM2.5, leads to 3.3 (95 per cent confidence interval 1.61-4.81) million premature deaths per year worldwide, predominantly in Asia. We primarily assume that all particles are equally toxic, but also include a sensitivity study that accounts for differential toxicity. We find that emissions from residential energy use such as heating and cooking, prevalent in India and China, have the largest impact on premature mortality globally, being even more dominant if carbonaceous particles are assumed to be most toxic. Whereas in much of the USA and in a few other countries emissions from traffic and power generation are important, in eastern USA, Europe, Russia and East Asia agricultural emissions make the largest relative contribution to PM2.5, with the estimate of overall health impact depending on assumptions regarding particle toxicity. Model projections based on a business-as-usual emission scenario indicate that the contribution of outdoor air pollution to premature mortality could double by 2050.

3,848 citations

Journal ArticleDOI
09 Oct 2014-Nature
TL;DR: The results suggest that, in addition to mitigating primary particulate emissions, reducing the emissions of secondary aerosol precursors from fossil fuel combustion and biomass burning is likely to be important for controlling China’s PM2.5 levels and for reducing the environmental, economic and health impacts resulting from particulate pollution.
Abstract: Rapid industrialization and urbanization in developing countries has led to an increase in air pollution, along a similar trajectory to that previously experienced by the developed nations. In China, particulate pollution is a serious environmental problem that is influencing air quality, regional and global climates, and human health. In response to the extremely severe and persistent haze pollution experienced by about 800 million people during the first quarter of 2013 (refs 4, 5), the Chinese State Council announced its aim to reduce concentrations of PM2.5 (particulate matter with an aerodynamic diameter less than 2.5 micrometres) by up to 25 per cent relative to 2012 levels by 2017 (ref. 6). Such efforts however require elucidation of the factors governing the abundance and composition of PM2.5, which remain poorly constrained in China. Here we combine a comprehensive set of novel and state-of-the-art offline analytical approaches and statistical techniques to investigate the chemical nature and sources of particulate matter at urban locations in Beijing, Shanghai, Guangzhou and Xi'an during January 2013. We find that the severe haze pollution event was driven to a large extent by secondary aerosol formation, which contributed 30-77 per cent and 44-71 per cent (average for all four cities) of PM2.5 and of organic aerosol, respectively. On average, the contribution of secondary organic aerosol (SOA) and secondary inorganic aerosol (SIA) are found to be of similar importance (SOA/SIA ratios range from 0.6 to 1.4). Our results suggest that, in addition to mitigating primary particulate emissions, reducing the emissions of secondary aerosol precursors from, for example, fossil fuel combustion and biomass burning is likely to be important for controlling China's PM2.5 levels and for reducing the environmental, economic and health impacts resulting from particulate pollution.

3,372 citations

Book
01 Jan 1986
TL;DR: The Gaussian Plume Equation and Air Quality Models Atmospheric Removal Processes and Residence Times Air Pollution Statistics Acid Rain Index (AIRI) as mentioned in this paper, which measures the amount of acid rain in the air.
Abstract: Air Pollutants Effects of Air Pollution Sources of Pollutants in Combustion Processes Gas-Phase Atmospheric Chemistry Aqueous-Phase Atmospheric Chemistry Mass Transfer Aspects of Atmospheric Chemistry Properties of Aerosols Dynamics of Single Aerosol Particles Thermodynamics of Aerosols and Nucleation Theory Dynamics of Aerosol Population Air Pollution Meteorology Micrometeorology Atmospheric Diffusion Theories The Gaussian Plume Equation The Atmospheric Diffusion Equation and Air Quality Models Atmospheric Removal Processes and Residence Times Air Pollution Statistics Acid Rain Index.

2,708 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the current state of understanding of the air pollution problems in China's mega cities and identify the immediate challenges to understanding and controlling air pollution in these densely populated areas.

2,164 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
20232,127
20224,079
20212,199
20202,238
20191,905