A cleanroom or clean room is an environment, typically used in manufacturing or scientific research, that has a low level of environmental pollutants such as dust, airborne microbes, aerosol particles and chemical vapors. More accurately, a cleanroom has a controlled level of contamination that is specified by the number of particles per cubic meter at a specified particle size. To give perspective, the ambient air outside in a typical urban environment contains 35,000,000 particles per cubic meter in the size range 0.5 μm and larger in diameter, corresponding to an ISO 9 cleanroom, while an ISO 1 cleanroom allows no particles in that size range and only 12 particles per cubic meter of 0.3 μm and smaller (see table below).

Cleanrooms can be very large. Entire manufacturing facilities can be contained within a cleanroom with factory floors covering thousands of square meters. They are used extensively in semiconductor manufacturing, biotechnology, the life sciences and other fields that are very sensitive to environmental contamination.

Baba Ali (Persian: بابا علی‎; born Ali Ardekani in 1975) is the co-founder (along with Mahdi Ahmad) of UmmahFilms, a Muslim film company that has produced a web series including the "Reminder" series and "Ask Baba Ali" series. Though of Muslim heritage, he was originally irreligious and accepted Islam after studying many religions, including wicca.

A worker in the IT field by profession in California, Ardekani quickly rose to prominence within the online Muslim community with Ummah films that claim Islam is the best religion in the West and discuss various Islamic topics. Using humor, Baba Ali's work has found its way to television on the Islam Channel (Broadcast in the UK) and he has become a frequent guest at various Muslim conferences and events (Including the ICNA-MAS convention and Evening of Inspiration) and the Global Peace and Unity Event. His efforts have been featured in The New York Times and USA Today. Baba Ali recently launched his latest project, Half Our Deen, to help Muslims get married. Currently writing the screenplay for a full length film. His films have grown widely popular on Youtube, gaining over 10 million views.