Prague is the capital and the biggest city of the Czech Republic. Into its present-day shape it has been developing for eleven centuries.
Nowadays it covers a total area of 496 square kilometres with 1,187,000 inhabitants.
Prague is built on both banks of the Vltava river which runs through the city in the length of 30 km. Due to this has Prague rather rugged topography.
The average elevation is 235 m above sea level. Between maximum (399 m) and minimum (177 m) altitude is the difference more then 200 m.
Department of Environment, Division of Air Quality Protection at City of Prague is responsible for management of air quality in Prague. This department
monitors the emissions and air pollution, orders the permissions and restrictions.
The Prague City Council in cooperation with the Czech Hydrometeorological Institute (CHMI) guaranteeing the Air Quality Monitoring. They operates network
consisting of 13 automatic monitoring stations. The data on air pollution are evaluated and on-line available for the city administration and public on the
website PREMIS. Monitoring data and data on other sources of pollution are integrated into the regular biannual off-line modelling of the ambient air
quality and published in the yearly books of environment of Prague.
CHMI operates the Airviro system for near real-time air quality modelling. Maps of concentrations of main pollutants are available also on the web, updated each hour.