air pollution

• Presença de substâncias nocivas ou excessivas na atmosfera, como gases, partículas sólidas ou moléculas biológicas, que representam perigo para a saúde humana, o meio ambiente ou o clima.

The presence of harmful or excessive substances in the atmosphere, such as gases, particulates, or biological molecules, that pose risks to human health, the environment, or the climate.

1. Contamination of the atmosphereB1formal

   The presence of harmful substances in the air, such as chemicals, particulate matter, or biological materials, that can cause damage to human health, the environment, and the climate.

   Poluição do ar

   • Air pollution in major cities often exceeds safe levels.
   • Burning fossil fuels is a primary cause of air pollution.
   • Wearing a mask can help reduce the effects of air pollution.

2. Environmental issueB2formal

   A major environmental problem caused by industrial and vehicle emissions, often addressed by government regulations and international agreements.

   Poluição do ar

   • The government introduced new laws to combat air pollution.
   • International summits often discuss solutions to air pollution.
   • Air pollution is a key concern for urban planners.