Several European countries are affected by fipronil-contaminated eggs, causing millions of eggs to be removed from shelves in Belgium, Germany and the Netherlands.
Belgium's second biggest city, Antwerp, has announced it will introduce a daily charge from 2017 for the most polluting cars, local media reported on Wednesday.
The European Commission is referring Belgium and Bulgaria to EU Court of Justice over persistently high levels of the dust particles which pose a major risk to public health.