Catalytic processes play a big role in environment protection, especially processes of heterogeneous catalytic oxidation and reduction, which can reduce unwanted emissions of pollutants found in waste gases and waste water. Aim of this work was a review of catalytic procedures and catalysts that are applied in environment protection in order to reduce emissions in atmosphere. In introduction part of the work, a review of usual atmosphere pollutants is given, as well as their sources. State of atmosphere is also shown, with special accent being on nitrogen oxides and volatile organic compounds. For each group mentioned, there are their usual representatives and processes for reduction of emissions in atmosphere named. Moreover, catalytic processes applied in environment protection are described in detail. Special accent is given on processes of catalytic oxidation and features of catalysts used for that process. Detailed review of catalysts used for oxidation of volatile organic compounds is also shown. Advanced designs of monolithic catalysts and reactors are discussed in the continuation of the work. Today are monolithic catalysts accustomed part of technologies applied for environment protection, precisely for treatment of waste gases and exhaust gases, coming from mobile or stationary sources. Monolithic catalysts are also used for more environmentally acceptable energy production. Because of great potential of monolithic designs of catalysts and reactors, it is expected that development of new technologies for their production, improvement of features of existing structures and development of new ones, will have a signific impact on environment condition, and consequently also on life quality.