'Unified, data-driven approach essential to tackle pollution': CAQM launches study, Pg4

Key Highlights:

• The CAQM has launched a source apportionment study to create a new emissions inventory for Delhi-NCR.
• The study will use high-resolution mapping to track pollution sources like household heating and crop residue burning.
• The goal is to strengthen the Decision Support System (DSS), a real-time tool for monitoring pollution sources.
• The study is being conducted by a consortium led by the Automotive Research Association of India (ARAI).
• A CAQM report identified secondary particulates as a major contributor to winter pollution.
• Transport contributes 23% to winter pollution, while biomass burning accounts for around 20% of PM2.5 concentrations.

Detailed Insights:

• The CAQM initiated the study due to inconsistencies in previous studies stemming from differing methodologies.
• The new study aims for a unified, data-driven approach to reduce emission uncertainty and improve air quality management.
• Findings will be integrated into the Air Quality Early Warning System and DSS for more accurate, real-time data.
• The study will map emissions on a high-resolution 500 m x 500 m grid across Delhi-NCR.
• Secondary particulates, formed from gases emitted by vehicles and biomass, significantly worsen pollution in the Indo-Gangetic Plain (IGP).
• Delhi's pollution profile varies by season, with dust dominant in summer and combustion-related emissions in winter.
• The report highlights the impact of transboundary pollution and the influence of meteorology on trapping pollutants.
• Low wind speeds and a shallow Planetary Boundary Layer (PBL) create a "lid" effect, preventing pollutant dispersion.

Key Concepts Involved:

• Source Apportionment: Identifying and quantifying the contribution of different pollution sources.
• PM2.5: Fine particulate matter with a diameter of 2.5 micrometers or less, a major air pollutant.
• Decision Support System (DSS): A real-time tool to keep a tab on Delhi’s dynamic pollution sources.