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| Content Provider | Springer Nature Link |
|---|---|
| Author | Xu, Wen Wu, Qinghua Liu, Xuejun Tang, Aohan Dore, Anthony J. Heal, Mathew R. |
| Copyright Year | 2015 |
| Abstract | Air pollution is one of the most serious environmental problems in China due to its rapid economic development alongside a very large consumption of fossil fuel, particularly in the North China Plain (NCP). During the period 2011–2014, we integrated active and passive sampling methods to perform continuous measurements of NH$_{3}$, HNO$_{3}$, NO$_{2}$, and PM$_{2.5}$ at two urban, one suburban, and two rural sites in the NCP. The annual average concentrations of NH$_{3}$, NO$_{2}$, and HNO$_{3}$ across the five sites were in the ranges 8.5–23.0, 22.2–50.5, and 5.5–9.7 μg m$^{−3}$, respectively, showing no significant spatial differences for NH$_{3}$ and HNO$_{3}$ but significantly higher NO$_{2}$ concentration at the urban sites. At each site, annual average concentrations of NH$_{3}$ and NO$_{2}$ showed increasing and decreasing trends, respectively, while there was no obvious trend in annual HNO$_{3}$ concentrations. Daily PM$_{2.5}$ concentrations ranged from 11.8 to 621.0 μg m$^{−3}$ at the urban site, from 19.8 to 692.9 μg m$^{−3}$ at the suburban site, and from 23.9 to 754.5 μg m$^{−3}$ at the two rural sites, with more than 70 % of sampling days exceeding 75 μg m$^{−3}$. Concentrations of water-soluble ions in PM$_{2.5}$ ranked differently between the non-rural and rural sites. The three dominant ions were NH$_{4}$ $^{+}$, NO$_{3}$ $^{−}$, and SO$_{4}$ $^{2−}$ and mainly existed as (NH$_{4}$)$_{2}$SO$_{4}$, NH$_{4}$HSO$_{4}$, and NH$_{4}$NO$_{3}$, and their concentrations averaged 48.6 ± 44.9, 41.2 ± 40.8, and 49.6 ± 35.9 μg m$^{−3}$ at the urban, suburban, and rural sites, respectively. Ion balance calculations indicated that PM$_{2.5}$ was neutral at the non-rural sites but acidic at the rural sites. Seasonal variations of the gases and aerosols exhibited different patterns, depending on source emission strength and meteorological conditions. Our results suggest that a feasible pathway to control PM$_{2.5}$ pollution in the NCP should target ammonia and acid gases together. |
| Starting Page | 1158 |
| Ending Page | 1172 |
| Page Count | 15 |
| File Format | |
| ISSN | 09441344 |
| Journal | Environmental Science and Pollution Research |
| Volume Number | 23 |
| Issue Number | 2 |
| e-ISSN | 16147499 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2015-10-27 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Air pollution Reactive N PM$_{2.5}$ Control strategies Chemical characteristics The North China Plain Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine |
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