Blade Runner and Genre

Film noir is a cycle of mainly American films of the 1940’s and 50’s exploring the darker aspects of modernity and usually set in a criminal milieu or exploring the consequences of a criminal act.
The word ‘noir’ is a French word known as black. This is relevant because Film Noir was originated from French film critics who noticed the new dark style of film and media through American crime and detective films.
Fear and paranoia is the essence of film noir. When Blade Runner was released in 1982, Reagan’s Second Cold War was underway, and the United States was coming to the end of a economic recession. In Blade Runner’s future, Japanese businesses and culture have overrun Los Angeles, and the world in general is a bleak, inhospitable place. Virtually all animals have died, leaving lonely humans to design and build artificial creatures for companionship. Classic noir suggests that increased industrialization breeds alienation, and in the hyper-industrialized world of Blade Runner, this is especially true.
Blade Runner certainly merges common tropes identical to noir and incorporates them into a futuristic setting. Harrison Ford’s character Rick Deckard is a stereotypical private detective and the film’s general atmosphere engenders a ‘sense of pervasive and impending doom’.

Deckland is seen to be a human by first glance but if you analyse his characterisation and look deeper into his speech and actions you can see his unhuman characteristics. Deckard being a replicant can be seen in one quotation from Gaff. At one point Rachael asks Deckard if he's ever taken the test himself (Deckard dozes off, however, leaving the audience to ponder the question). Also, at the end of the movie, Gaff tells Deckard: "You've done a man's job, sir!"

Science fiction is a genre of fiction in which the stories often tell about science and technology of the future. It is important to note that science fiction has a relationship with the principles of science—these stories involve partially true-partially fictitious laws or theories of science. It should not be completely unbelievable, because it then ventures into the genre fantasy.

Science fiction and fantasy both answer the question, "What if?" Science fiction takes our current understanding of how the universe works and imagines ideas and technologies that we haven't seen yet, but still could fit within that understanding. It's fiction that expands on what we know about science, operating on familiar principles.

Like all drama, science fiction explores the human condition, but it can look at it from unexpected angles. Science fiction imagines strange challenges and opportunities for us in order to delve deep into human nature. That's why some of the most provocative science fiction starts with men and women very similar to us - what these people do when faced with unusual crises speaks directly to who we are in our everyday lives.

Blade runner can almost be seen as a typical science fiction film as it has all of the elements that some may say constitutes to create the perfect sci fi. The Los Angeles 2019 city space automatically lets the audience know that this film is set in the future. The city within the film and film itself shows a very dark side to technology, expelling modern tones of skyscrapers and city centres.
The city is very chaotic and over-crowded which is a reasonably forseeable outcome of future in the perspective of the audience which allows this film to be seen as scientifically fictional, but almost believable in a sense.