The authors have reasonably well addressed the comments of the two anonymous referees and they have modified their manuscript accordingly. However, many alterations and corrections are needed for the Main text and Supplement before the manuscript can be published in ACP.

For the Main text:
Lines 21, 22, 23, 27, 37, 67, 80, 172, 306, 336, 375 (twice), 378, 401, 405, 406, and 407: Replace "i.e." by "i.e.,".
Line 30: Replace "biasing source" by "biasing the source" and replace "on MM-PMF" by "on the MM-PMF".
Line 32: Replace "and SOA" by "and the SOA" and replace "to PM2.5" by "to the PM2.5".
Line 37: Replace "particulate matters" by "particulate matter".
Line 70: Replace "compositions," by "composition,".
Line 78: Replace "Method" by "Methods".
Line 80: Replace "compositions" by "composition".
Line 86: Replace "Locations" by "Location".
Line 90: Replace "by Monitor" by "by a Monitor".
Line 93: Replace "nondispersive" by "energy-dispersive".
Line 96: Replace "were achieved using a Thermal" by "was achieved using Thermal".
Line 101: Abbreviations and acronyms, here "GC", should be defined (written full-out) when first used.
Line 102: Replace "with derivatization" by "with a derivatization".
Line 111: Replace "agreements in" by "agreement in".
Line 128: Replace "specie in" by "species in".
Line 132: Replace "of mass" by "of the mass".
Line 137: Replace "for PMF" by "for the PMF".
Line 141: Replace "to PMF" by "to the PMF".
Line 142: Replace "anhydro sugars" by "anhydrosugars".
Line 143: Replace "and etc." by "etc.".
Line 154: Replace "path on" by "paths on".
Line 164: Replace "contributing to" by "contributing with".
Line 165: Replace "contributed to" by "contributed with" and replace "of PM2.5" by "of the PM2.5".
Line 166: Replace "component and" by "components and".
Page 8, Tables 1 and 2: Several numeric data are given with too many significant figures; two significant figures suffice and three in case the first one is "1"; thus, for example, replace "46.3" and "33.8" by "46" and "34", respectively, and replace "45.91" and "39.17" by "46" and "39", respectively; also within the text several numeric data are given with too many significant figures; for example, in line 164, replace "46.3±33.8" by "46±34" and replace "32.0% and 25.2%" by "32% and 25%", and in line 303, replace "0.843-0.993" by "0.84-0.99".
Line 192: Replace "detail descriptions" by "detailed description".
Line 194: Replace "for PMF" by "for the PMF".
Lines 196 and 198: Replace "with secondary" by "with the secondary".
Line 200: Replace "are given" by "is given".
Line 208: Replace "Secondary nitrate" by "The secondary nitrate".
Line 219: Replace "The individual" by "Individual".
Line 228: Replace "contributed to" by "contributed with".
Line 229: Replace "The profiles" by "The profile".
Line 233: Replace "with the tire" by "with tire".
Line 235: Replace "al.,2013" by "al., 2013".
Line 236: Replace "to total" by "to the total".
Line 248: Replace "in Shanghai" by "in the Shanghai" and replace "diurnal variations" by "diurnal variation".
Line 254: Replace "to total" by "to the total".
Line 258: Replace "factor ro" by "factor to".
Line 259: Replace "Diurnal variations" by "The diurnal variation".
Line 262: Replace "contributes to" by "contributes with".
Line 267: Replace "of biomass burning factor also ontains" by "of the biomass burning factor also contains".
Line 268: Replace "from a mixed" by "from mixed".
Line 269: Replace "diurnal variations" by "diurnal variation".
Line 272: Replace "diurnal variations of the cooking factor show" by "diurnal variation of the cooking factor shows".
Line 274: Replace "contributes to only" by "contributes only".
Line 278: Replace "Fig.3" by "Fig. 3" and replace "of toluene" by "of a toluene".
Line 280: Replace "represents a mixed" by "represents mixed".
Line 282: Replace "and secondary" by "and the secondary".
Line 287: Replace "Overall, MM-PMF" by "Overall, the MM-PMF".
Line 292: Replace "comonality" by "commonality".
Line 294: Replace "accout for" by "account for".
Line 295: Replace "contributed the" by "contributing the".
Line 297: Replace "PMF model" by "The PMF model".
Line 305: Replace "This diffience" by "This difference".
Line 307: Replace "for secondary sulfate factor and EC for vehicle" by "for the secondary sulfate factor and EC for the vehicle".
Line 311: Replace "than those for" by "than for".
Line 313: Replace "contributions from" by "the contribution from".
Line 315: Replace "MM-MMPF" by "MM-PMF".
Line 317: Replace "distribute contributions" by "distribute the contributions".
Line 318: Replace "between two" by "between the two".
Line 319: Replace "Coal combution contribution" by "The coal combustion contribution" and replace "and residual" by "and the residual".
Line 320: Replace "generates more" by "generates a more".
Line 321: Replace "In another" by "In other".
Line 325: Replace "contribution to" by "contributions to".
Line 328: Replace "Fig.7" by "Fig. 7".
Line 329: Replace "mass originated from northeastern" by "masses originating from the northeastern".
Line 330: Replace "of the toal trajectories" by "of all trajectories" and replace "account for 36% of the total" by "accounts for 36% of all".
Line 331: Replace "of total trajectories" by "of all trajectories" (twice) and replace "air mass and" by "air masses and".
Line 332: Replace "air mass," by "air masses,".
Line 355: Replace "Briefly, PM2.5" by "Briefly, the PM2.5".
Line 336: Replace "air mass influence" by "air masses".
Line 337: Replace "air mass" by "air masses".
Line 338: Replace "air mass" by "air masses" (twice).
Line 341: Replace "by TrajStat model. The percentage in the brackets" by "by the TrajStat model. The percentage in parentheses".
Line 344: Replace "MM-PMF factor" by "The MM-PMF factor".
Line 345: Replace "of individual factor" by "of the individual factors".
Line 346: Replace "influences of air" by "influence of air".
Line 347: Replace "and vehicle" by "and the vehicle".
Lines 347-348: Replace "regardless air mass cluster types. Secondary nitrate" by "regardless of air mass cluster type. The secondary nitrate".
Line 349: Replace "ofNOx" by "of NOx".
Line 353: Replace "need from heating" by "need of heating".
Line 356: Replace "from northern continental area. Vehicle" by "from the northern continental area. The vehicle".
Line 362: Replace "Dust show similar" by "Dust shows similar".
Line 374: Replace "mainly fall under" by "mainly falls under".
Line 377: Replace "than the" by "than during the".
Line 388: Replace "among sources while source" by "among the sources while the source".
Line 391: Replace "in Beijing" by "in the Beijing".
Line 393: Replace "high contributions of" by "high contribution of".
Line 394: Replace "among three" by "among the three".
Line 413: Replace "air mass" by "air masses".
Line 416: Replace "in Shanghai" by "in the Shanghai".
Line 426: Replace "are suggested" by "is suggested".
Pages 21-25, References:
- for authors with more than one initial there should be a space between the initials;
- titles of journal articles should be in lower case and not in Title Case.
Line 475: Replace "205 226" by "205-226".
Line 550: Replace "Acs. Earth. Space. Chem." by "ACS Earth Space Chem.".
Lines 556-557: Replace "ACS Earth and Space Chemistry" by "ACS Earth Space Chem.".
Line 573: Replace "Kong, china" by "Kong, China".

For the Supplement:
Line 8: Replace "from PD site" by "from the PD site".
Line 9: Replace "from SAES site" by "from the SAES site".
Line 17: Replace "for general" by "for the general".
Line 20: Replace "are similar." by "are similar".
Line 27: Replace "in Pudong district" by "in the Pudong district".
Line 28: Replace "in Xuhui district" by "in the Xuhui district".
Line 30: Replace "are similar." by "are similar".
Lines 32, 63, and 71: Replace "i.e." by "i.e.,".
Line 35: Replace "of PM2.5" by "of the PM2.5".
Line 37: Replace "at two" by "at the two".
Line 42: Replace "in sync" by "in synchrony".
Line 43: Replace "at SAES site" by "for the SAES site".
Line 49: Replace "well between them throughout" by "well throughout".
Line 51: Replace "between two" by "between the two".
Line 55: Replace "combined data set to achieve comprehensive" by "a combined data set to achieve a comprehensive".
Line 57: Replace "at PD" by "at the PD".
Lines 64 and 68: Replace "at two" by "at the two".
Line 74: Replace "between PD" by "between the PD".
Line 75: Replace "during measurement" by "during the measurement".
Line 78: Replace "between PD" by "between the PD".
Line 79: Replace "during measurement" by "during the measurement".
Line 84: Replace "at PD and SAES sites during" by "at the PD and SAES sites during the".
Page S-5, Table S1: Several numeric data are given with too many significant figures; two significant figures suffice and three in case the first one is "1".
Line 91: Replace "during measurement" by "during the measurement".
Line 97: Replace "Change of" by "The change of", replace "are often" by "is often", and replace "help factor" by "help in the factor".
Line 103: Replace "examining factor" by "examining the factor".
Lines 104-105: Replace "from secondary nitrate factors" by "and the secondary nitrate factor".
Line 109: Replace "Finally," by "Finally, the".
Line 119: Replace "in EPA" by "in the EPA".
Line 124: Replace "there are a" by "there is a".
Line 129: Replace "indicate robust" by "indicates robust".
Line 136: Replace "of BS" by "of the BS".
Lines 141 and 146: Replace "The model" by "Model".
Line 156: Replace "in eight-factor" by "in the eight-factor".
Lines 164 and 165: Replace "The average concentration of PM2.5 and its major components under different clusters" by "Average concentration of PM2.5 and its major components for different air mass clusters".
Line 168: Replace "under different clusters" by "for different air mass clusters".
Line 177: Replace "The average concentrations" by "Average concentrations".

A few minor alterations are still needed for the Main text before the manuscript can be published in ACP:
Lines 101-102: Replace "gas chromatography spectrometer (GC)" by "gas chromatography (GC) spectrometer".
Page 8, Table 1, for Cl-: Replace "0.8" by "0.78" and replace "0.5" by "0.52".