• Recently, the 2021 World Air Quality Report was released, the report presented an overview of the state of global air quality in 2021.
  • IQAir, a Swiss group that measures air quality levels based on the concentration of Particulate Matter (PM) 2.5.
  • IQAirendeavours to engage, educate, and inspire governments, researchers, Non-Government Organisations companies, and citizens to work together to improve air quality and create healthier communities and cities.

Need for the Report

  • Air pollution is now considered to be the world’s largest environmental health threat, accounting for seven million deaths around the world every year.
  • Air pollution causes and aggravates many diseases, ranging from asthma to cancer, lung illnesses and heart disease.
  • The estimated daily economic cost of air pollution has been figured at USD 8 billion, or 3 to 4% of the Gross World Product (GWP)
  • GWP is the combined Gross Domestic Product (GDP) of all the countries in the world equals the total global GDP.
  • Air pollution affects those that are most vulnerable the most. It is estimated that in 2021, the deaths of 40,000 children under the age of five were directly linked to PM2.5 air pollution.
  • Further, in this age of Covid-19, researchers have found that exposure to PM2.5 increases both the risk of contracting the virus and of suffering more severe symptoms when infected, including death.

PM 2.5

  • The report is based on PM2.5 air quality data from 6,475 cities in 117 countries, regions and territories around the world.
  • 5, particulate matter consisting of fine aerosol particles measuring 2.5 microns or smaller in diameter, is one of six routinely measured criteria air pollutants and is commonly accepted as the most harmful to human health due to its prevalence in the environment and broad range of health effects.
  • 5 is generated from many sources and can vary in chemical composition and physical characteristics.
  • Common chemical constituents of PM2.5 include sulphates, nitrates, black carbon, and ammonium.
  • The most common human-made sources include internal combustion engines, power generation, industrial processes, agricultural processes, construction, and residential wood and coal burning.
  • The most common natural sources for PM2.5 are dust storms, sandstorms, and wildfires.


  • Air pollution has a massive impact on human health in India.
  • It is the second biggest risk factor for disease, and the economic cost of air pollution is estimated to exceed USD 150 billion dollars annually.
  • Major sources of air pollution in India include vehicular emissions, power generation, industrial waste, biomass combustion for cooking, the construction sector, and episodic events like crop burning.
  • In 2019, India’s Ministry of Environment, Forest and Climate Change (MoEF&CC) enacted the National Clean Air Program (NCAP).
  • The plan seeks to reduce PM concentrations by 20% to 30% by 2024 in all identified non-attainment cities, increase air quality monitoring, and implement a city, regional, and state-specific clean air action plan as well as conduct source apportionment studies.
  • However, the lockdowns, restrictions, and resulting economic downturn due to the COVID-19 pandemic have made it difficult to determine the plan’s impact based on air pollution levels alone.

Way Forward

Adhering to WHO’s 4 Pillar Strategy: WHO adopted a resolution (2015) to address the adverse health effects of air pollution. There is a need to adhere to a roadmap highlighted under this.

This 4-pillar strategy calls for an enhanced global response to the adverse health effects of air pollution. Those four pillars are:

  1. Expanding the knowledge base
  2. Monitoring and reporting
  3. Global leadership and coordination
  4. Institutional capacity strengthening


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