Question: Which city named the world's worst city for light pollution contains the area known as Mong Kok?

Context paragraphs:
Yuen Po Street Bird Garden: Yuen Po Street Bird Garden () is located in Mong Kok, Kowloon, Hong Kong, directly west of Mong Kok Stadium.  The garden occupies an area of 3,000m and is bounded by Boundary Street, Embankment Road, Prince Edward Road West and Yuen Po Street.

KMB Route 1A: KMB Route 1A is a bus route operated by Kowloon Motor Bus (KMB) in Hong Kong.  It runs between Star Ferry and Sau Mau Ping (Central) and provides air-conditioned service.  The route runs via Tsim Sha Tsui, Yau Ma Tei, Mong Kok, Kowloon City, San Po Kong, Ngau Tau Kok, Kwun Tong, and Sau Mau Ping.

Mong Kok culture: Mong Kok culture (MK文化) is a local terminology used in Hong Kong denoting a specific culture in the area of Mong Kok, a culture which has grown rather prevalent amongst local youths and teenagers.  The area of Mong Kok is especially known for its plethora of stores and vendors who sell assorted knickknacks, playthings, clothing, tools, electronics, and food along with all other sorts of novelties.  Mong Kok also provides a variety of entertainment for young adults and teenagers, among which includes the cinema.  The multipurpose nature of the area thus draws in teenagers and young adults, of whom which avidly pursue the latest popular trends.  The area is also a popular meet-up and dating location amongst local youths.  Teenagers who have a high affinity for the Mong Kok culture and hang around the area but do not necessarily live there are known as MK people (MK guys or MK girls depending on their gender) or a MK person.  Their age typically ranges between 14-25 and often dress in particular styles of clothing, including Hip Hop or punk, without fully acknowledging the implications of what they wear.

Tai Kok Tsui Ferry Pier: Tai Kok Tsui Ferry Pier (1972–1992) () was a ferry pier in Tai Kok Tsui, Kowloon, Hong Kong.  It started operation in 1972, together with an adjacent bus terminus, to replace the Mong Kok Ferry Pier in Mong Kok.  It provided a ferry service to and from Central, Hong Kong and Guangzhou, Mainland China.  Its cross-boundary ferry terminal position was replaced by the Hong Kong China Ferry Terminal in Tsim Sha Tsui in 1988.  It was then closed in 1992 to cope with land reclamation work for the Airport Core Programme.  The bus terminus remained in use until it was relocated to a new reclaimed area in west Tai Kok Tsui in 1995.  The pier has been reclaimed and the HSBC Centre now stands where the former bus terminal used to be.

Light pollution in Hong Kong: Hong Kong has been named the world's worst city for light pollution.  Commercial and residential areas Mong Kok, Tsim Sha Tsui and Causeway Bay are found to be the most severe areas of light pollution.  Due to the spotlights and LED billboards, Hong Kong’s sky is many times brighter than other cities’.

Mong Kok: Mong Kok (also spelled Mongkok, often abbreviated as MK) is an area in the Yau Tsim Mong District, on the western part of Kowloon Peninsula in Hong Kong.  The Prince Edward area occupies the northern part of Mong Kok.

Tai Kok Tsui: Tai Kok Tsui ( or ) is an area west of Mong Kok in Kowloon, Hong Kong.  The mixed land use of industrial and residential is present in the old area.  The Cosmopolitan Dock and oil depots were previously located there.  Blocks of high-rise residential buildings have been erected on the reclaimed area to the west, which marked the revitalization of the area with many restaurants and bars setting up shop.  Many of the older residential buildings have been vacated and are set to be replaced by luxury high-rise buildings.

Canton Road: Canton Road is a major road in Hong Kong, linking the former west reclamation shore in Tsim Sha Tsui, Jordan, Yau Ma Tei and Mong Kok on the Kowloon Peninsula.  The road runs mostly parallel and west to Nathan Road.  It starts from the junction with Salisbury Road in the south and ends in the north at the junction with Lai Chi Kok Road in the Prince Edward area.  The southern part Canton Road is home to many upscale retail shops, shopping centres and others business establishments, with busy traffic from both vehicles and pedestrians from morning till late night.

Prince Edward, Hong Kong: Prince Edward is an area in northern Kowloon, Hong Kong.  It is adjacent to the Prince Edward Station of the MTR rapid transit system in Mong Kok.  It is administratively under the Yau Tsim Mong District.  It was named after the namesake road.  It contains the northern end of Nathan Road.  Strictly speaking it is not an area on its own, but the northern part of Mong Kok.  Mong Kok Police Station is right outside the MTR station.

Fife Street: Fife Street () is a street in Mong Kok, Kowloon, Hong Kong.  It was named after the Scottish council area of Fife.  It runs in the east-west direction from Canton Road to Sai Yee Street, intersecting Reclamation Street, Shanghai Street, Portland Street, Nathan Road, Sai Yeung Choi Street and Fa Yuen Street.  A footbridge in the eastern section of the street links the MTR station of Mong Kok East.

Supporting paragraphs: Light pollution in Hong Kong Mong Kok
Answer: Hong Kong