Visual Dictionary Online


Powered by

air pollutionclick to hear

The presence in the atmosphere of large quantities of particles or gases produced by human activity; these are harmful to both animal and plant life.
air pollution paddy field soil fertilization intensive husbandry deforestation motor vehicle pollution industrial waste acid rain wind smog air pollutants forest fire authorized landfill site polluting gas emission

paddy field click to hear

Paddy fields release considerable quantities of methane.

soil fertilization click to hear

Nitrogen fertilizers used to fertilize the soil also release nitrogen oxides.

intensive husbandry click to hear

Bacteria involved in the digestion of ruminants also trigger the emission of methane into the air.

deforestation click to hear

Large-scale deforestation leads to increased carbon dioxide levels in the atmosphere since plants alone absorb and retain this gas.

motor vehicle pollution click to hear

Motor vehicle exhaust contains carbon particles, nitrogen oxides, sulfur dioxide and hydrocarbons.

industrial waste click to hear

Depending on their activity, industries emit a great variety of pollutants such as nitrogen oxides, sulfur dioxide, ozone, heavy metals and hydrocarbons.

acid rain click to hear

Rain that contains an unusually high concentration of sulfuric acid and nitric acid.

wind click to hear

Polluted clouds are carried by the wind, sometimes traveling thousands of miles; their pollutants then fall in the form of acid rain.

smog click to hear

Harmful haze resulting from the presence of polluting gases; it forms over cities under specific meteorological conditions.

air pollutants click to hear

The principal air pollutants are sulfur dioxide, nitrogen oxides, hydrocarbons, methane and carbon dioxide.

forest fire click to hear

Forest fires and brush fires release carbon monoxide, methane and nitrogen oxides.

authorized landfill site click to hear

In waste landfill sites, decomposing organic matter produces methane.

polluting gas emission click to hear

Most polluting gases are present in the atmosphere in minuscule quantities, but human activity increases their concentration.