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Byline: Susanta. Padhy, Sidharth. Sarkar, Mahima. Panigrahi, Surender. Paul We all know that 2014 has been declared as the hottest year globally by the Meteorological department of United States of [...]

Air pollution affects not only the air quality in megacities but also in medium and small-sized cities due to rapid urbanization, industrialization, and other anthropogenic activities. From October 28, 2015 to November 3, 2015, the Indo-Gangetic Plains region, including Chandigarh encountered an episode of poor visibility during the daytime. The daily average PM 2.5 concentration reached 191 μg/m3, and visibility reduced by ∼2.2 times in the Chandigarh region. PM 2.5 concentration was found around 4 times higher than a non-haze day and more than 3 times higher than National Ambient Air Quality Standards for 24 h. A significant correlation between PM 2.5 and CO (r: 0.87) during the haze period indicated similarity in their emission sources; which was attributed to the burning of solid organic matter. Further, satellite data and back-trajectory analysis of air masses showed large-scale rice stubble burning in the agricultural fields, adjoining to the city areas. The transboundary movement of air masses below 500 m and meteorological conditions played a major role in building the pollution load in the Chandigarh region. Moreover, the enhanced concentration of biomass burning tracers, i.e., organic carbon (∼3.8 times) and K+ ions (2∼ times) in PM 2.5 and acetonitrile (∼2.3 times) in ambient air was observed during the haze event. The study demonstrates how regional emissions and meteorological conditions can affect the air quality in a city; which can be useful for proper planning and mitigation policies to minimize high air pollution episodes. [Display omitted] • PM 2.5 levels were 4 times higher during haze event in IGP region, India. • Report strong association (r : 0.87) between PM 2.5 & CO, indicated a common source. • Haze event was due to the regional crop residue burning emission & meteorology. • K+ & Acetonitrile levels confirm solid biomass burning as the primary contributor. • Airmass trajectories passing over the region of fire activities confirm the sources. [ABSTRACT FROM AUTHOR]