As air pollution continues to plague much of China, proactive diners look for ways to eat away the problem. It's not so easy, Mike Peters reports.

Sometimes, all I need is the air that I breathe - and to love mackerel.

That play on words from an old song hints of one way that people cope with the ongoing effects of air pollution: Changing what they eat. Especially in northern China with its troubling levels of PM2.5, many are ready to meet the problem halfway, by adjusting our intake of food and drink to offset the effects of bad air.