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'both': [121, 242], 'significantly': [124], 'summer.': [127, 178], 'variation': [129], 'with': [130, 174], 'elevated': [131], 'nighttime': [136], 'found': [139], 'B.': [142, 256], 'Secondary': [143], 'inorganic': [144], 'aerosols': [145], '(NH4+,': [146], 'NO3−': [147, 166], 'SO42−)': [149], 'exhibited': [150], 'clear': [151], 'day–to–night': [152], 'variation.': [153], 'Concentration': [154], 'SO42−': [156], 'about': [158], '15%': [159], 'daytime': [162, 198], 'samples.': [163], 'NH4+': [164], 'co–varied': [167], 'but': [170, 199], 'weakly': [172], 'associated': [173], 'each': [175], 'other': [176], 'Sites': [179], 'B': [182], 'almost': [185], 'all': [186], 'ammonium–rich': [187, 200], 'whereas': [190], 'ammonium–poor': [195], 'night.': [203], 'Positive': [204], 'matrix': [205], 'factorization': [206], '(PMF)': [207], 'model': [208], 'analysis': [209], 'showed': [210], 'that': [211], 'secondary': [212, 229], 'formation,': [213], 'biomass': [214, 232], 'burning,': [215], 'regional': 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'updated_date': '2024-12-07T16:00:09.776435', 'created_date': '2016-06-24'}