Abbreviations	Full Name
AI	artificial intelligence
ANN	artificial neural network
AQGs	Global Air Quality Guidelines
ARIMA	autoregressive integrated moving average
bior	biorthogonal
BP	back propagation
BR	Bayesian regularization algorithm
CA	approximate composition
CD	detailed composition
CNN	convolutional neural network
coif	coiflet
CWT	continuous wavelet transform
DA-RNN	dual-stage attention-based recurrent neural network
db	Daubechies
DL	deep learning
DTR	decision tree regressor
DWT	discrete wavelet transform
EMD-GRU	gated recurrent unit neural network based on empirical mode decomposition
EWV	extreme wind velocity
GA-SVM	combined genetic algorithm and support vector machine
GBDT	gradient boosted decision trees
GBM	gradient boosting machine
GBRT	gradient boosting regression tree
GDP	gross domestic product
GRU	gated recurrent unit neural network
LM	Levenberg–Marquardt algorithm
LSTM	long short-term memory
MAE	mean absolute error
MAP	mean atmospheric pressure
MAT	mean atmospheric temperature
MAXAP	maximum atmospheric pressure
MAXAT	maximum atmospheric temperature
MAXWV	maximum wind velocity
MINAP	minimum atmospheric pressure
MINAT	minimum atmospheric temperature
MINRH	minimum relative humidity
ML	machine learning
MLR	multiple linear regression
MRH	mean relative humidity
MWP	mean water vapor pressure
MWV	mean wind velocity
P	precipitation
PM2.5	fine particulate matter
R	correlation coefficient
RE	relative error
ReLU	rectified linear unit
RF	random forest
RMSE	root mean square error
RNN	recurrent neural network
SH	sunshine hours
SVM	support vector machine
SVR	support vector regression
sym	symlet
WANN	wavelet-ANN
W-GRU	wavelet-GRU
WHO	World Health Organization
W-LSTM	wavelet-LSTM
WT	wavelet transformation
XGBoost	extreme gradient boosting