City cleaners collected 841,327 krathong baskets floated on Bangkok's waterways and ponds during the festival on Thursday night and only 5.3% of them were made from styrofoam.
Bangkok governor Aswin Kwanmuang said collection of krathong from the Chao Phraya River, local canals and 30 public parks that had stayed open for the Loy Krathong festival finished about 5am on Friday.
The total was up 3.62% on the 811,945 baskets collected after the festival last year.
He said 796,444, or 94.7%, were made from natural and biodegradable materials. The other 44,883, or 5.3%, were based on styrofoam.
The percentage of natural and biodegradable krathong was up from 93.6% last year, and the proportion of foam floats down from 6.4%.
The governor said the largest number of krathong, 33,257, were collected in Lat Krabang district and the fewest, 230, in Pomprap Sattruphai district. He would continue City Hall's campaign against styrofoam krathong.