Abstract
PM2.5 is an important air pollution index, which has been widely concerned. An excellent PM2.5 prediction system can effectively help people protect their respiratory tract from injury. However, due to the strong uncertainty of PM2.5 data, the accuracy of traditional point prediction and interval prediction method is not satisfactory, especially for interval prediction, which is usually difficult to achieve the expected interval coverage (PINC). In order to solve the above problems, a new hybrid PM2.5 prediction system is proposed, which can quantify the certainty and uncertainty of future PM2.5 at the same time. For point prediction, a multi-strategy improved multi-objective crystal algorithm (IMOCRY) is proposed; the chaotic mapping and screening operator are added to make the algorithm more suitable for practical application. At the same time, the combined neural network based on unconstrained weighting method further improves the point prediction accuracy. For interval prediction, a new strategy is proposed, which uses the combination of fuzzy information granulation and variational mode decomposition to process the data. The high-frequency components are extracted by the VMD method, and then quantified by FIG method. By this way, the fuzzy interval prediction results with high coverage and low interval width are obtained. Through 4 groups of experiments and 2 groups of discussions, the advanced nature, accuracy, generalization, and fuzzy prediction ability of the prediction system are all satisfactory, which verified the effect of the system in practical application.
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Data availability
The datasets generated during and/or analyzed during the current study are not publicly available due but are available from the corresponding author on reasonable request.
Abbreviations
- VMD :
-
Variational Mode Decomposition
- BP :
-
Back Propagation Neural Network
- Elman :
-
Elman Neural Network
- MOCRY :
-
Multi-objective Crystal Algorithm
- IMOCRY :
-
Improved Multi-objective Crystal Algorithm
- MSE :
-
Mean Square Error
- RMSE :
-
Root Mean Square Error
- AIS :
-
Average Interval Score
- ACE :
-
Average Coverage Error
- FIG :
-
Fuzzy Information Granulation
- LSTM :
-
Long Short-Term Memory
- MOSSA :
-
Multi-objective Sparrow Search Algorithm
- MOMVO :
-
Multi-objective Multi-verse Optimization
- MAPE :
-
Mean Absolute Percentage Error
- MAE :
-
Mean Absolute Error
- R 2 :
-
R-Square
- PICP :
-
PI Coverage Probability
- MPIW :
-
The Mean PI Width
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This work is supported by the National Natural Science Foundation of China (No.42276231).
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Zhirui Tian: methodology, software, formal analysis, writing—original draft preparation; Mei Gai: data curation, software, conceptualization, financial support, writing—original draft preparation.
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Tian, Z., Gai, M. A novel air pollution prediction system based on data processing, fuzzy theory, and multi-strategy improved optimizer. Environ Sci Pollut Res 30, 59719–59736 (2023). https://doi.org/10.1007/s11356-023-26578-1
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DOI: https://doi.org/10.1007/s11356-023-26578-1