Vancouver metro makes data for concentration of different emissions in the atmosphere available for all different cities through out the province. Each air monitoring station in Vancouver represents about 112 km2, and serves about 8400 people. Tokyo, has approximately 83 air monitoring sites, in an area of 13 500 km2 and services about 36.6 million people. This means each air monitoring station represents about 440 000 people, and covers and area of about 166 km2. The volume of Tokyo is he making air pollution much harder to control since it is so densely populated. However Tokyo varies in its density, the downtown core would have many more people, but in the down town more people take subways and public transit as well offsetting there pollution. Studies have shown that the air pollution is improving in Tokyo in recent years. All automobile emissions measuring station met the environmental standards of suspended particulate matter in recent years. Since 1970 the government of Japan has been much more strict with its environmental standards for air quality, with the CO2 now at 1/5th of what it used to be in 1970. Overall Tokyo has made large improvements in air quality considering its vast population.