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Relationship between Air Quality and Meteorological Conditions in the Hotan Oasis, Xinjiang
Maimaitiabuttula Yimier, Bupatiman Aibaidoula, CHEN Tian-yu, Mayila Maimaiti, ZHAO Yu-qian
2020, 37 (1):
46-57.
In this study, the daily data
of air quality and the conventional meteorological data from the Hotan Oasis
were used to analyze the air quality over the study area from January 1, 2015
to December 31, 2017. The relationships among the air quality and the meteorological
factors were discussed. The results showed that the three-year average AQI in
the Hotan Oasis was 199, the air pollution was moderate, and the days with air
pollution accounted for 78.1% of the total. Seasonally, the air quality in
spring was the worst, then that in summer, and the air pollution was the
slightest in autumn and winter. The annual average concentrations of PM10 and PM2.5 were 333 μg·m-3 and 100 μg·m-3, and
the days when the values of PM10 and PM2.5 exceeded the
standards accounted for 75.7% and 49.5% of the total, respectively. The days when
the values of other pollutants exceeded the standards were lower than 3%. The
concentration of PM10 was the highest in spring, then in summer and
autumn, and it was the lowest in winter. The concentration of PM2.5 was the highest in spring, then in summer and winter, and it was the lowest in
autumn. The concentrations of SO2, NO2 and CO were the
highest in winter, then in spring and autumn, and it was the lowest in summer.
O3 concentration was the highest in summer, then in spring and
autumn, and it was the lowest in winter. Except precipitation, AQI was
significantly correlated with other meteorological factors. Except the absence
of correlations between the average temperature and PM2.5, relative
humidity and CO, and precipitation and SO2, PM10, O3 and PM2.5, other meteorological factors affected significantly the
IAQI. Visibility was significantly correlated with AQI and IAQI. AQI decreased
with the increase of visibility. Under the similar visibility, the pollutant
concentration was higher in summer half year when the occurring frequency of
dust weather was high than that in winter half year when the occurring
frequency of dust weather was low. With the improvement of visibility, the
concentrations of SO2, PM10, CO and PM2.5 tended
to a decrease, the concentration of O3 increased, and the concentration
of NO2 changed irregularly. Moreover, the concentrations of PM10,
O3 and PM2.5 were higher in summer half year than in
winter half year, and the concentrations of SO2, CO and NO2 were higher in winter half year than in summer half year. When the visibility
was lower than 1 km, the pollutant concentration under dense floating dust weather
was similar to that in sandstorm; when the visibility varied in a range of 1-3.5
km, the pollutant concentration under floating dust weather was similar to that
under blowing sand weather; when the visibility was higher than 3.5 km, the
pollutant concentration under floating dust weather was higher than that under blowing
sand weather. The concentrations of PM10 and PM2.5 decreased with the increase of the lowest visibility, and the change of concentrations
of other pollutants with the change of the lowest visibility was different.
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