Impact Factor & Key Scientometrics


Impact Factor


H Index


Impact Factor


I. Basic Journal Info


United Kingdom
Journal ISSN: 00173134, 16512049
Publisher: Taylor & Francis
History: 1970-1974, 1978-ongoing
Journal Hompage: Link
How to Get Published:

Research Categories


Grana is an international journal of palynology and aerobiology. Grana, originally published as Grana Palynologica, was founded in 1954 by Professor Gunnar Erdtman. It is published under the auspices of the Scandinavian Palynological Collegium (CPS) in affiliation with the International Association for Aerobiology (IAA). Grana publishes original papers, mainly on ontogony (morphology, and ultrastructure of pollen grains and spores of Eucaryota and their importance for plant taxonomy, ecology, phytogeography, paleobotany, etc.) and aerobiology. Aerobiology involves studies of airborne biological particles, such as pollen, spores, etc., and their launching, dispersal and final deposition.

II. Science Citation Report (SCR)

SCR Impact Factor

SCR Journal Ranking

SCImago SJR Rank

SCImago Journal Rank (SJR indicator) is a measure of scientific influence of scholarly journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from.


Scopus 2-Year Impact Factor Trend

Note: impact factor data for reference only

Scopus 3-Year Impact Factor Trend

Note: impact factor data for reference only

Scopus 4-Year Impact Factor Trend

Note: impact factor data for reference only

Impact Factor History

2-year 3-year 4-year
  • 2022 Impact Factor
    0.917 1.028 1.029
  • 2021 Impact Factor
    0.973 1.058 1.161
  • 2020 Impact Factor
    1.242 1.264 1.344
  • 2019 Impact Factor
    1 1.024 1.037
  • 2018 Impact Factor
    1 1.114 1.25
  • 2017 Impact Factor
    1.205 1.156 1.085
  • 2016 Impact Factor
    1.063 1.064 1.151
  • 2015 Impact Factor
    0.909 1 1.104
  • 2014 Impact Factor
    1.034 NA NA
  • 2013 Impact Factor
    0.922 NA NA
  • 2012 Impact Factor
    0.882 NA NA
  • 2011 Impact Factor
    0.614 NA NA
  • 2010 Impact Factor
    0.947 NA NA
  • 2009 Impact Factor
    0.881 NA NA
  • 2008 Impact Factor
    0.579 NA NA
  • 2007 Impact Factor
    0.774 NA NA
  • 2006 Impact Factor
    0.79 NA NA
  • 2005 Impact Factor
    0.629 NA NA
  • 2004 Impact Factor
    0.533 NA NA
  • 2003 Impact Factor
    0.537 NA NA
  • 2002 Impact Factor
    0.455 NA NA
  • 2001 Impact Factor
    0.378 NA NA
  • 2000 Impact Factor
    0.309 NA NA
Note: impact factor data for reference only




Impact Factor

Impact factor (IF) is a scientometric factor based on the yearly average number of citations on articles published by a particular journal in the last two years. A journal impact factor is frequently used as a proxy for the relative importance of a journal within its field. Find out more: What is a good impact factor?

III. Other Science Influence Indicators

Any impact factor or scientometric indicator alone will not give you the full picture of a science journal. There are also other factors such as H-Index, Self-Citation Ratio, SJR, SNIP, etc. Researchers may also consider the practical aspect of a journal such as publication fees, acceptance rate, review speed. (Learn More)


The h-index is an author-level metric that attempts to measure both the productivity and citation impact of the publications of a scientist or scholar. The index is based on the set of the scientist's most cited papers and the number of citations that they have received in other publications


H-Index History