Jamaica's Shelly-Ann Fraser-Pryce finishes ahead of Britain's Dina Asher-Smith in the Women's 100m final at the 2019 IAAF World Athletics Championships at the Khalifa International Stadium in Doha on September 29
The local organising committee said in a statement that attendances on Friday and Saturday were "solid" but were "down on our expectations" on Sunday, which they said "coincided with the start of the working week in Qatar."
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"The challenge we face with a competition schedule that is geared to support global TV viewership, is that some finals are not starting until the late evening," it said.
"This impacts on the number of spectators remaining until the end of the session."
The LOC said it was "confident with our additional communications (that) we will see more attendees for longer periods."
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It then mentioned the boycott which has been imposed on Qatar by Bahrain, Saudi Arabia, United Arab Emirates and Egypt, who accuse the Gulf state of supporting terrorism, which it denies.
"Our vision was for a first world championships in the Middle East. An IAAF World Athletics Championships that would welcome the world and connect to new fans. Despite facing unique challenges as hosts, in terms of the political blockade, that ambition remains," it said.
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The statement added that the athletes competing at the Khalifa stadium have "relished the experience."
"The controlled temperature conditions on the track have been ideal and fitting for world-class performances and will remain so," it said.