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Comparison of Hourly PM2.5 Observations Between Urban and Suburban Areas in Beijing, China.

Yao L, Lu N, Yue X, Du J, Yang C - Int J Environ Res Public Health (2015)

Bottom Line: The data demonstrates a unique monthly variation form, as compared with other major cities.Additionally, the nighttime peak in weekdays (21:00 p.m.) is one hour later than weekends (20:00 p.m.) which also shows the evidence of human activity.These observed facts indicate that the variations of PM2.5 concentration between urban and suburban areas in Beijing are influenced by complex meteorological factors and human activities.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, No.11A, Datun Road, Chaoyang, Beijing 100101, China. yaoling@lreis.ac.cn.

ABSTRACT
Hourly PM2.5 observations collected at 12 stations over a 1-year period are used to identify variations between urban and suburban areas in Beijing. The data demonstrates a unique monthly variation form, as compared with other major cities. Urban areas suffer higher PM2.5 concentration (about 92 μg/m³) than suburban areas (about 77 μg/m³), and the average PM2.5 concentration in cold season (about 105 μg/m³) is higher than warm season (about 78 μg/m³). Hourly PM2.5 observations exhibit distinct seasonal, diurnal and day-of-week variations. The diurnal variation of PM2.5 is observed with higher concentration at night and lower value at daytime, and the cumulative growth of nighttime (22:00 p.m. in winter) PM2.5 concentration maybe due to the atmospheric stability. Moreover, annual average PM2.5 concentrations are about 18 μg/m³ higher on weekends than weekdays, consistent with driving restrictions on weekdays. Additionally, the nighttime peak in weekdays (21:00 p.m.) is one hour later than weekends (20:00 p.m.) which also shows the evidence of human activity. These observed facts indicate that the variations of PM2.5 concentration between urban and suburban areas in Beijing are influenced by complex meteorological factors and human activities.

No MeSH data available.


Similar diurnal pattern of PM2.5 concentration at all clusters. It is clear that urban areas have higher PM2.5 concentration than suburban. Cluster 1 always suffers the highest PM2.5 concentration and cluster 4 mostly enjoys the minimum value.
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ijerph-12-12264-f003: Similar diurnal pattern of PM2.5 concentration at all clusters. It is clear that urban areas have higher PM2.5 concentration than suburban. Cluster 1 always suffers the highest PM2.5 concentration and cluster 4 mostly enjoys the minimum value.

Mentions: As shown in Figure 3, a pronounced diurnal cycle in PM2.5 concentrations is evident among all the clusters. On the whole, the diurnal variation of PM2.5 is observed with higher concentration at night than daytime, the minimum concentration generally appears in the early afternoon. This finding is consistent with prior research [28]. It is worth noting that there is a significant minimum around noon (14:00 p.m.), because the meteorological condition at this time is impeditive for the formation of the thermal inversion layer.


Comparison of Hourly PM2.5 Observations Between Urban and Suburban Areas in Beijing, China.

Yao L, Lu N, Yue X, Du J, Yang C - Int J Environ Res Public Health (2015)

Similar diurnal pattern of PM2.5 concentration at all clusters. It is clear that urban areas have higher PM2.5 concentration than suburban. Cluster 1 always suffers the highest PM2.5 concentration and cluster 4 mostly enjoys the minimum value.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4626967&req=5

ijerph-12-12264-f003: Similar diurnal pattern of PM2.5 concentration at all clusters. It is clear that urban areas have higher PM2.5 concentration than suburban. Cluster 1 always suffers the highest PM2.5 concentration and cluster 4 mostly enjoys the minimum value.
Mentions: As shown in Figure 3, a pronounced diurnal cycle in PM2.5 concentrations is evident among all the clusters. On the whole, the diurnal variation of PM2.5 is observed with higher concentration at night than daytime, the minimum concentration generally appears in the early afternoon. This finding is consistent with prior research [28]. It is worth noting that there is a significant minimum around noon (14:00 p.m.), because the meteorological condition at this time is impeditive for the formation of the thermal inversion layer.

Bottom Line: The data demonstrates a unique monthly variation form, as compared with other major cities.Additionally, the nighttime peak in weekdays (21:00 p.m.) is one hour later than weekends (20:00 p.m.) which also shows the evidence of human activity.These observed facts indicate that the variations of PM2.5 concentration between urban and suburban areas in Beijing are influenced by complex meteorological factors and human activities.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, No.11A, Datun Road, Chaoyang, Beijing 100101, China. yaoling@lreis.ac.cn.

ABSTRACT
Hourly PM2.5 observations collected at 12 stations over a 1-year period are used to identify variations between urban and suburban areas in Beijing. The data demonstrates a unique monthly variation form, as compared with other major cities. Urban areas suffer higher PM2.5 concentration (about 92 μg/m³) than suburban areas (about 77 μg/m³), and the average PM2.5 concentration in cold season (about 105 μg/m³) is higher than warm season (about 78 μg/m³). Hourly PM2.5 observations exhibit distinct seasonal, diurnal and day-of-week variations. The diurnal variation of PM2.5 is observed with higher concentration at night and lower value at daytime, and the cumulative growth of nighttime (22:00 p.m. in winter) PM2.5 concentration maybe due to the atmospheric stability. Moreover, annual average PM2.5 concentrations are about 18 μg/m³ higher on weekends than weekdays, consistent with driving restrictions on weekdays. Additionally, the nighttime peak in weekdays (21:00 p.m.) is one hour later than weekends (20:00 p.m.) which also shows the evidence of human activity. These observed facts indicate that the variations of PM2.5 concentration between urban and suburban areas in Beijing are influenced by complex meteorological factors and human activities.

No MeSH data available.