ULPA

ULPA - type of air filter. Article “ULPA” in Japanese Wikipedia has 0.2 points for quality (as of July 1, 2026). The article also contains templates indicating quality issues, therefore its score was reduced by 0.01 points.

This article has the best quality in German Wikipedia. However, the most popular language version of this article is English.

Since the creation of article “ULPA”, its content was written by 7 registered users of Japanese Wikipedia and edited by 88 registered Wikipedia users in all languages.

The article is cited 10 times in Japanese Wikipedia and cited 438 times in all languages.

The highest Authors Interest rank from 2001:

• Local (Japanese): #39811 in March 2013
• Global: #76084 in February 2010

The highest popularity rank from 2008:

• Local (Japanese): #64495 in April 2020
• Global: #303909 in April 2020

There are 9 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2026 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

#	Language	Quality grade	Quality score
1	German (de) Ultra-low-Penetration-Air-Filter		23.3206
2	English (en) Ultra-low particulate air		19.685
3	Korean (ko) ULPA 필터		17.9809
4	Spanish (es) Filtro para partículas ultra-pequeñas en aire		13.4443
5	Swedish (sv) ULPA-filter		13.3968
6	Chinese (zh) 超低穿透空氣過濾網		12.4712
7	Arabic (ar) جسيمات الهواء المتناهية الصغر		9.2415
8	Persian (fa) فیلتر اولپا		3.8629
9	Japanese (ja) ULPA		0.1936

More...

The following table shows the most popular language versions of the article.

The most popular language versions of the article "ULPA" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Ultra-low particulate air		320 029
2	Japanese (ja) ULPA		187 570
3	Chinese (zh) 超低穿透空氣過濾網		22 217
4	German (de) Ultra-low-Penetration-Air-Filter		11 642
5	Persian (fa) فیلتر اولپا		11 633
6	Swedish (sv) ULPA-filter		6 775
7	Spanish (es) Filtro para partículas ultra-pequeñas en aire		3 316
8	Korean (ko) ULPA 필터		530
9	Arabic (ar) جسيمات الهواء المتناهية الصغر		449

More...

The following table shows the language versions of the article with the highest popularity in the last month.

The most popular language versions of the article "ULPA" in June 2026

#	Language	Popularity award	Relative popularity
1	English (en) Ultra-low particulate air		518
2	Japanese (ja) ULPA		91
3	Chinese (zh) 超低穿透空氣過濾網		83
4	German (de) Ultra-low-Penetration-Air-Filter		77
5	Korean (ko) ULPA 필터		51
6	Spanish (es) Filtro para partículas ultra-pequeñas en aire		38
7	Swedish (sv) ULPA-filter		27
8	Persian (fa) فیلتر اولپا		9
9	Arabic (ar) جسيمات الهواء المتناهية الصغر		0

More...

The following table shows the language versions of the article with the highest Authors’ Interest.

Language versions of the article "ULPA" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) Ultra-low particulate air		37
2	German (de) Ultra-low-Penetration-Air-Filter		21
3	Chinese (zh) 超低穿透空氣過濾網		9
4	Japanese (ja) ULPA		7
5	Persian (fa) فیلتر اولپا		6
6	Swedish (sv) ULPA-filter		4
7	Arabic (ar) جسيمات الهواء المتناهية الصغر		3
8	Spanish (es) Filtro para partículas ultra-pequeñas en aire		1
9	Korean (ko) ULPA 필터		0

More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

Language versions of the article "ULPA" with the highest AI in June 2026

#	Language	AI award	Relative AI
1	Arabic (ar) جسيمات الهواء المتناهية الصغر		0
2	German (de) Ultra-low-Penetration-Air-Filter		0
3	English (en) Ultra-low particulate air		0
4	Spanish (es) Filtro para partículas ultra-pequeñas en aire		0
5	Persian (fa) فیلتر اولپا		0
6	Japanese (ja) ULPA		0
7	Korean (ko) ULPA 필터		0
8	Swedish (sv) ULPA-filter		0
9	Chinese (zh) 超低穿透空氣過濾網		0

More...

The following table shows the language versions of the article with the highest number of citations.

Language versions of the article "ULPA" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	English (en) Ultra-low particulate air		249
2	Persian (fa) فیلتر اولپا		99
3	Chinese (zh) 超低穿透空氣過濾網		69
4	Japanese (ja) ULPA		10
5	Spanish (es) Filtro para partículas ultra-pequeñas en aire		4
6	Korean (ko) ULPA 필터		4
7	Swedish (sv) ULPA-filter		2
8	German (de) Ultra-low-Penetration-Air-Filter		1
9	Arabic (ar) جسيمات الهواء المتناهية الصغر		0

More...

#	Language	Value
ar	Arabic جسيمات الهواء المتناهية الصغر
de	German Ultra-low-Penetration-Air-Filter
en	English Ultra-low particulate air
es	Spanish Filtro para partículas ultra-pequeñas en aire
fa	Persian فیلتر اولپا
ja	Japanese ULPA
ko	Korean ULPA 필터
sv	Swedish ULPA-filter
zh	Chinese 超低穿透空氣過濾網

Best Rank

Japanese: #64495 04.2020

Global: #303909 04.2020

Best Rank

Japanese: #39811 03.2013

Global: #76084 02.2010

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The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information