Immense quantities of harmful substances are emitted to the atmosphere every day but due to their spread they seem to be apparently harmless. Small doses of pesticides ingested with food, weak electromagnetic fields (cellular fields, office equipment) are also harmful, but risk assessment is difficult. Mistakenly, only the most noticeable factors are considered in the analysis of low-level emissions. And in the human environment, like in technology, only 20% of causes are responsible for 80% of effects.