The company claims it is not responsible for the pollution in the river.
The once azure skies of Athens have been ruined by atmospheric pollution.
Stricter controls on air pollution would help to reduce acid rain.
The following two examples outline cases where the gross pollution function does not exhibit constant returns to scale.
In regions with higher pollution levy rates, firms tend to have lower pollution intensity.
In many developing countries, pollution control regulations are formulated at the national level, but their enforcement is the responsibility of local environmental protection bureaus.
