Seasonal Variability of Air Pollutants and Their Relationships to Meteorological Parameters in an Urban Environment

IF 2.1 4区地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES

Advances in Meteorology Pub Date : 2022-12-17 DOI:10.1155/2022/5628911

S. Shelton, G. Liyanage, Sanduni Jayasekara, B. Pushpawela, Upaka S. Rathnayake, Akila Jayasundara, Lesty Dias Jayasooriya

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引用次数: 6

Abstract

Air quality in urban areas is deteriorating over time with the increased pollutant distribution levels mainly caused due to anthropogenic activities. In addition, these pollutant distribution levels may relate to changing meteorological conditions. However, the relationships were not researched in-depth in the context of Sri Lanka, a country with a significant impact on climate change. The main objective of this study was to provide a broader perspective on the seasonal variation of tiny particles in air (PM2.5 and PM10), nitrogen dioxide (NO2), carbon monoxide (CO), ozone (O3), and sulfur dioxide (SO2) in two urban cities (Colombo and Kandy) in Sri Lanka over 3 years period (2018–2021) and the possible relationships between air pollution and meteorological variables. Results show that all the aforementioned pollutants except O3 consistently depict two peaks during the day, one in the morning (∼07:00–09:00 local time) and the other in the evening (∼18:00–20:00 local time). These peaks coincided with the traffic jams observed in both cities. The results further revealed that the concentration of all pollutants has significant seasonal variations. Compared to two monsoon seasons, the highest daily average PM2.5 (31.2 μg/m3), PM10 (49.5 μg/m3), NO2 (18.9 ppb), CO (717.5 ppb), O3 (18.5 ppb), and SO2 (9.4 ppb) concentrations in Colombo are recorded during northeast monsoon (NEM) seasons while contrast pattern is observed in Kandy. In addition, it was found that wind speed with its direction is the most influencing factor for the pollutant concentration except for SO2 and O3 in two cities, and this is irrespective of the season. This study’s findings contribute to understanding the seasonality of ambient air quality and the relationship between meteorological factors and air pollutants. These findings ultimately lead to designing and implementing season-specific control strategies to achieve air pollution reduction at a regional scale.

查看原文本刊更多论文

城市环境中大气污染物的季节变化及其与气象参数的关系

城市地区的空气质量随着时间的推移而恶化，污染物分布水平的增加主要是由人为活动引起的。此外，这些污染物分布水平可能与不断变化的气象条件有关。然而，这些关系并没有在斯里兰卡这个对气候变化有重大影响的国家的背景下进行深入研究。本研究的主要目的是为斯里兰卡两个城市（科伦坡和康提）3年（2018-2021）空气中微小颗粒物（PM2.5和PM10）、二氧化氮（NO2）、一氧化碳（CO）、臭氧（O3）和二氧化硫（SO2）的季节变化以及空气污染与气象变量之间的可能关系提供更广泛的视角。结果表明，除O3外，上述所有污染物在白天都有两个峰值，一个在早上（当地时间～07:00～09:00），另一个在晚上（当地时间约18:00～20:00）。这些高峰与这两个城市的交通堵塞相吻合。结果进一步表明，各污染物浓度均存在显著的季节变化。与两个季风季节相比，最高的日均PM2.5（31.2 μg/m3）、PM10（49.5 μg/m3）、NO2（18.9 ppb），CO（717.5 ppb），O3（18.5 ppb）和SO2（9.4 ppb）在科伦坡的浓度记录在东北季风（NEM）季节，而在康提观察到对比模式。此外，研究发现，除SO2和O3外，风速及其方向是两个城市污染物浓度的最大影响因素，这与季节无关。这项研究的发现有助于理解环境空气质量的季节性以及气象因素与空气污染物之间的关系。这些发现最终导致设计和实施特定季节的控制策略，以实现区域范围内的空气污染减少。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Meteorology 地学天文-气象与大气科学

CiteScore

5.30

自引率

3.40%

发文量

审稿时长

>12 weeks

期刊介绍： Advances in Meteorology is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of meteorology and climatology. Topics covered include, but are not limited to, forecasting techniques and applications, meteorological modeling, data analysis, atmospheric chemistry and physics, climate change, satellite meteorology, marine meteorology, and forest meteorology.