Scholarlink

<p>Air pollution stands out as a major problem that threatens the environment and public health in urban environmets. In a densely populated megacity like İstanbul, the concentration and distribution of pollutants are greatly affected by meteorological conditions and local environmental factors. In this study, hourly air quality data (PM<sub>10</sub>, PM<sub>2.5</sub>, NO, NO<sub>2</sub>, NO<sub>x</sub>, SO<sub>2</sub> and O<sub>3</sub>), meteorological variables (temperature, relative humidity, wind speed and direction) and cloud base height (CBH) data measured with a ceilometer were analyzed between January 1, 2023 and December 31, 2023 in İstanbul. Pearson correlation coefficient, Mann-Kendall trend test and time series analysis methods were used to evaluate the data. The findings revealed seasonal variations in air pollutant levels and reach high concentrations in the winter months. It was determined that particulate pollutants such as PM<sub>10</sub> and PM<sub>2.5</sub> tend to accumulate especially in low temperature and high relative humidity (RH) conditions. A positive correlation was observed between RH and particulate pollutants, and a negative relationship with temperature and wind speed. For example, it was observed that particulate matter (PM) concentrations increased when the temperature decreased, and dispersion was facilitated during periods when wind speed was high. In addition, a strong relationship was found between CBH and air pollutants. Analyses showed that PM and gaseous pollutants tended to accumulate in the atmosphere during periods when CBH was low. This situation, combined with the decrease in atmospheric stability and the effect of high RH in winter months, further deteriorated air quality. Seasonal analyses showed that meteorological variables such as temperature, RH and wind had varying impacts on on air quality. In particular, it was determined that gaseous pollutants such as NO<sub>x</sub> and SO<sub>2</sub> increased during winter months, and this was associated with low atmospheric mixing and high stability conditions. Additionally, winds originating from certain directions were found to contribute to elevated pollutant concentrations.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The role of meteorological variables and cloud base heights in urban air quality

  • 期刊论文

  • 发表日期：

    2025年10月10日

查看全文
  • Enes Birinci,
  • Muhammed Denizoğlu,
  • Hüseyin Özdemir,
  • Hüseyin Toros,
  • Ali Deniz

摘要

Air pollution stands out as a major problem that threatens the environment and public health in urban environmets. In a densely populated megacity like İstanbul, the concentration and distribution of pollutants are greatly affected by meteorological conditions and local environmental factors. In this study, hourly air quality data (PM10, PM2.5, NO, NO2, NOx, SO2 and O3), meteorological variables (temperature, relative humidity, wind speed and direction) and cloud base height (CBH) data measured with a ceilometer were analyzed between January 1, 2023 and December 31, 2023 in İstanbul. Pearson correlation coefficient, Mann-Kendall trend test and time series analysis methods were used to evaluate the data. The findings revealed seasonal variations in air pollutant levels and reach high concentrations in the winter months. It was determined that particulate pollutants such as PM10 and PM2.5 tend to accumulate especially in low temperature and high relative humidity (RH) conditions. A positive correlation was observed between RH and particulate pollutants, and a negative relationship with temperature and wind speed. For example, it was observed that particulate matter (PM) concentrations increased when the temperature decreased, and dispersion was facilitated during periods when wind speed was high. In addition, a strong relationship was found between CBH and air pollutants. Analyses showed that PM and gaseous pollutants tended to accumulate in the atmosphere during periods when CBH was low. This situation, combined with the decrease in atmospheric stability and the effect of high RH in winter months, further deteriorated air quality. Seasonal analyses showed that meteorological variables such as temperature, RH and wind had varying impacts on on air quality. In particular, it was determined that gaseous pollutants such as NOx and SO2 increased during winter months, and this was associated with low atmospheric mixing and high stability conditions. Additionally, winds originating from certain directions were found to contribute to elevated pollutant concentrations.