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Article Hygroscopicity, Kappa (Κ), Alter Atmospheric Chemistry, and Cause Short-Term Adverse from 0.11 (Background) to 0.18 (fireworks)

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Article Hygroscopicity, Kappa (Κ), Alter Atmospheric Chemistry, and Cause Short-Term Adverse from 0.11 (Background) to 0.18 (fireworks) Atmos. Chem. Phys., 21, 6155–6173, 2021 https://doi.org/10.5194/acp-21-6155-2021 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. Measurement report: Firework impacts on air quality in Metro Manila, Philippines, during the 2019 New Year revelry Genevieve Rose Lorenzo1,2, Paola Angela Bañaga2,3, Maria Obiminda Cambaliza2,3, Melliza Templonuevo Cruz3,4, Mojtaba AzadiAghdam6, Avelino Arellano1, Grace Betito3, Rachel Braun6, Andrea F. Corral6, Hossein Dadashazar6, Eva-Lou Edwards6, Edwin Eloranta5, Robert Holz5, Gabrielle Leung2, Lin Ma6, Alexander B. MacDonald6, Jeffrey S. Reid7, James Bernard Simpas2,3, Connor Stahl6, Shane Marie Visaga2,3, and Armin Sorooshian1,6 1Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, Arizona, 85721, USA 2Manila Observatory, Quezon City, 1108, Philippines 3Department of Physics, School of Science and Engineering, Ateneo de Manila University, Quezon City, 1108, Philippines 4Institute of Environmental Science and Meteorology, University of the Philippines, Diliman, Quezon City, 1101, Philippines 5Space Science and Engineering Center, University of Wisconsin–Madison, Madison, Wisconsin, 53706, USA 6Department of Chemical and Environmental Engineering, University of Arizona, Tucson, Arizona, 85721, USA 7Marine Meteorology Division, Naval Research Laboratory, Monterey, CA, USA Correspondence: Armin Sorooshian ([email protected]) Received: 2 October 2020 – Discussion started: 4 November 2020 Revised: 15 February 2021 – Accepted: 19 February 2021 – Published: 23 April 2021 Abstract. Fireworks degrade air quality, reduce visibility, ics which increased bulk particle hygroscopicity, kappa (κ), alter atmospheric chemistry, and cause short-term adverse from 0.11 (background) to 0.18 (fireworks). Potassium and 2− health effects. However, there have not been any comprehen- non-sea-salt (nss) SO4 contributed the most (70.9 %) to the sive physicochemical and optical measurements of fireworks water-soluble mass, with their mass size distributions shift- and their associated impacts in a Southeast Asia megac- ing from a smaller to a larger submicrometer mode during ity, where fireworks are a regular part of the culture. Size- the firework event. On the other hand, mass size distributions − − 2C resolved particulate matter (PM) measurements were made for NO3 , Cl , and Mg (21.1 % mass contribution) shifted before, during, and after New Year 2019 at the Manila from a supermicrometer mode to a submicrometer mode. Be- Observatory in Quezon City, Philippines, as part of the ing both uninfluenced by secondary aerosol formation and Cloud, Aerosol, and Monsoon Processes Philippines Exper- constituents of firework materials, a subset of species were iment (CAMP2Ex). A high-spectral-resolution lidar (HSRL) identified as the best firework tracer species (Cu, Ba, Sr, KC, recorded a substantial increase in backscattered signal as- Al, and Pb). Although these species (excluding KC) only sociated with high aerosol loading ∼ 440 m above the sur- contributed 2.1 % of the total mass concentration of water- face during the peak of firework activities around 00:00 (lo- soluble ions and elements, they exhibited the highest enrich- cal time). This was accompanied by PM2:5 concentrations ments (6.1 to 65.2) during the fireworks. Surface microscopy peaking at 383.9 µg m−3. During the firework event, water- analysis confirmed the presence of potassium/chloride-rich soluble ions and elements, which affect particle formation, cubic particles along with capsule-shaped particles in fire- growth, and fate, were mostly in the submicrometer diam- work samples. The results of this study highlight how fire- eter range. Total (>0:056 µm) water-soluble bulk particle work emissions change the physicochemical and optical mass concentrations were enriched by 5.7 times during the properties of water-soluble particles (e.g., mass size distri- fireworks relative to the background (i.e., average of before bution, composition, hygroscopicity, and aerosol backscat- and after the firework). The water-soluble mass fraction of ter), which subsequently alters the background aerosol’s res- PM2:5 increased by 18.5 % above that of background values. pirability, influence on surroundings, ability to uptake gases, This corresponded to increased volume fractions of inorgan- and viability as cloud condensation nuclei (CCN). Published by Copernicus Publications on behalf of the European Geosciences Union. 6156 G. R. Lorenzo et al.: Firework impacts on air quality in Metro Manila 1 Introduction chi et al., 2008). Strontium in particular is an indicator of the spatial and temporal extent of firework smoke plumes Fireworks affect local populations through visibility reduc- (Perry, 1999) because of the high prevalence of red in fire- tion and increased health risks due to briefly elevated par- works, and it is not affected by traffic emissions (Moreno et ticulate matter (PM) levels. Total PM mass concentrations al., 2010). Other components measured in the air that have during local celebrations in the following cities exceeded the been attributed to fireworks include metals (Al, Cd, Cu, Ti, 24 h US National Ambient Air Quality Standard (NAAQS) Mg, Mn, Ni, Zn, As, Bi, Co, Ga, Hg, Cr, Pb, Rb, Sb, P, Tl, −3 for PM10 of 150 µg m : Leipzig, Germany, (Wehner et Ag) and their salt anion counterparts (S, P, Cl). Thallium al., 2000); Brownsville, Texas, United States (US) (Karnae, makes a green flame. Potassium and Ag (as AgCNO or sil- 2005); Montreal, Canada (Joly et al., 2010), and New Delhi, ver fulminate) are propellants, Al is fuel, and Pb provides India, (Mönkkönen et al., 2004). Firework emissions from at steady burn and is also used as an igniter for firework explo- least 19 studies have also been linked to exceedance of the sions. Chromium is a catalyst for propellants, Mg is a fuel, −3 2C 24 h US NAAQS limit for PM2:5 of 35 µg m (Lin, 2016, and Mg is a neutralizer or oxygen donor (U.S. Depart- and references therein). Higher PM concentrations from fire- ment of Labor, 2015). Manganese is either a fuel or oxidizer, works have been reported more frequently in Asia (i.e., In- and Zn is used for sparks (Licudine et al., 2012; Martín- dia, China, and Taiwan) compared to western countries (Lin, Alberca and García-Ruiz, 2014; Shimizu, 1981; Wang et al., 2016; Sarkar et al., 2010). 2007; Ennis and Shanley, 1991). Also from fuel and oxi- − 2− Health effects are of major concern during firework peri- dizer combustion are species such as NO3 , SO4 , and or- ods based on both short- and long-term exposure. For exam- ganics including oxaloacetic acid (Alpert and Hopke, 1981; ple, Diwali is a major firework festival in India, and it was Barman et al., 2008; Carranza et al., 2001; Dorado et al., shown that chronic exposure to three of the most prominent 2001; Drewnick et al., 2006; Joly et al., 2010; Joshi et al., tracer species (Sr, K, and Ba) translated to a 2 % increase 2016; Kulshrestha et al., 2004; Kumar et al., 2016; Lin et in health effects based on the non-carcinogenic hazard index al., 2016; Moreno et al., 2010; Sarkar et al., 2010; Tanda et (Sarkar et al., 2010). On the other hand, short-term expo- al., 2019; Thakur et al., 2010; Joshi et al., 2019). Firework- sure to firework pollutants increases asthma risk, eye aller- derived chloride in Taiwan has been attributed to raw ma- − C gies, cardiovascular and pulmonary issues, cough, and fever terials such as KClO3, ClO3, and ClO4 with Cl V Na ra- (Moreno et al., 2010; Singh et al., 2019; Barman et al., 2008; tios reaching approximately 3 (Tsai et al., 2012). Black car- Becker et al., 2000; Beig et al., 2013; Hirai et al., 2000). bon mass concentrations during firework events can either in- Firework pollutants also impact clouds and the hydrologi- crease due to firework emissions or decrease owing to fewer cal cycle, owing to associated aerosols serving as cloud con- vehicles on the road (Kumar et al., 2016; Yadav et al., 2019). densation nuclei (CCN) (Drewnick et al., 2006) and subse- In both cases, the black carbon mass fraction decreases due to quently impacting surface ecosystems after wet deposition a greater contribution of other constituents in firework emis- (Wilkin et al., 2007). Although fireworks emit particles with sions. Organic mass concentrations and mass fractions have various sizes into the atmosphere, fine particles associated been noted to increase and decrease, respectively, with fire- with PM2:5 are most relevant to public health effects, scatter- works (Zhang et al., 2019). Governed largely by composi- ing efficiency, and CCN activation (Vecchi et al., 2008; Perry, tion, particulate hygroscopicity and solubility have also been 1999). Knowing the various effects of firework emissions de- found to be altered by fireworks depending on the emitted pends on knowing their physical, chemical, and optical prop- species. Inorganic salts (K2SO4, KCl) dominated the aerosol erties. hygroscopicity in Xi’an, China, during fireworks (Wu et al., Measurements of the chemical composition of firework 2018). In the Netherlands, enhancements in salt mixtures 2− − 2C C emissions are important in order to understand how they af- containing SO4 , Cl , Mg , and K were noted to enhance fect local air quality. The main components of fireworks are hygroscopicity (ten Brink et al., 2018). Copper and Mg were fuels (metals and alloys, metalloids, and non-metals), ox- observed to become more soluble in firework emissions in idizers (nitrates, perchlorates, and chlorates), and coloring Delhi, India, while Mn, As, Ba, and Pb became less solu- agents (metal salts) (Steinhauser and Klapotke, 2010). Pre- ble (Perrino et al., 2011). The water-soluble aerosol com- vious studies have relied on tracer species to establish confi- ponents from fireworks in the Sichuan Basin (China) were dence in distinguishing the firework source from background internally mixed and enhanced the hygroscopicity of submi- air and other sources (Sarkar et al., 2010). Potassium histori- crometer aerosols, especially the larger particles (Yuan et al., cally has been the most observable tracer for fireworks emis- 2020).
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