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Article analysis:

The article provides a comprehensive overview of the status and characteristics of ambient PM 2.5 pollution in global megacities in 2013. The data used is based on official monitoring networks and composition data reported in the literature which makes it reliable and trustworthy. However, there are some potential biases that should be noted such as one-sided reporting as only 45 global megacities are discussed without any comparison to other cities or regions outside of these 45 cities; this could lead to an incomplete understanding of the issue at hand. Additionally, there is no mention of possible risks associated with high levels of PM 2.5 pollution or any counterarguments that could be made against the findings presented in the article; this could lead to a lack of understanding about how serious this issue is or what can be done to address it effectively. Furthermore, there is no discussion about how different countries are tackling this issue or what strategies have been successful so far; this could lead to a lack of insight into potential solutions for reducing PM 2.5 pollution levels globally. Finally, there is no mention of any promotional content which suggests that the article is unbiased and presents both sides equally without any bias towards one side or another. In conclusion, while the article provides a comprehensive overview of ambient PM 2.5 pollution in global megacities in 2013 it does have some potential biases that should be noted when considering its trustworthiness and reliability