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In a recent finding it was published that there are five (05) major cities across Delhi / NCR which falls under the World's most polluted cities (historical data 2017-2022) based on annual average PM2.5 concentration (μg/m3). The present study is entirely focused on Delhi / NCR and the measurement is done through the continuous type of air quality monitoring analyzers. Various activities like construction, manufacturing, trash burning, production units, burning of organic compounds, power plants, biomass burning, demolition, vehicular emission etc. are the key sources that contribute to poor air quality. As a result of these activities, numerous dangerous chemicals, pollutants with different ionic species (along with gases and aerosols) are released and pose serious threats to health and environment.