The lower South Island has some of the worst pollution rates in the country, a new study has found, with Christchurch, Timaru and Invercargill among the highest per capita.
Data released this week shows car exhausts, or nitrogen dioxide pollution, is doing more harm to New Zealander's health than initially thought - killing thousands of people every year.
But, as Niva Chittock reports, the problem isn't new for Canterbury.
