"Emission standards are the legal requirements governing air pollutants released into the atmosphere."
The process of reducing or eliminating pollutants from the air to improve air quality.
"They are generally designed to achieve air quality standards and to protect human life."
"Emission standards set quantitative limits on the permissible amount of specific air pollutants."
"Different regions and countries have different standards for vehicle emissions."
"They are designed to protect human life and achieve air quality standards."
"Emission standards are the legal requirements..." (Implying that they are regulated by the government or relevant authorities)
"Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources..."
"Emission standards set quantitative limits on the permissible amount of specific air pollutants..."
"Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over specific timeframes."
"They are generally designed to achieve air quality standards..."
"They are generally designed to... protect human life."
"Different regions and countries have different standards for vehicle emissions."
"Emission standards are generally designed to achieve air quality standards..."
"Different regions and countries have different standards for vehicle emissions."
"Emission standards are the legal requirements..."
"Emission standards set quantitative limits on the permissible amount of specific air pollutants released into the atmosphere."
"Emission standards set quantitative limits..."
"Different regions and countries have different standards for vehicle emissions."
"Emission standards are generally designed to achieve air quality standards..."
"Emission standards are the legal requirements governing air pollutants released into the atmosphere."