The first week of November has been shrouded in a hazy smog. All over Shanghai, the sunshine is dissolving into a colorful sky. It made me want to look at the numbers. It is bad, but how bad?
First of all I looked at the NOx satellite maps from the research institute in Heidelberg. They have published global maps of their measurement results. Up until the 90’s, the nitrogen oxide concentration was the most common metric for air pollution. The NO2 molecules can turn into nitric acid and acid rain.
But NOx is not everything. Today we can set up measurement stations to measure particulates (PM2.5/PM10), ozone, SO2, NOx etc, and calculate an “air quality index”. A few years ago, the American Embassy started to publish air quality measurements on-line, which led to a diplomatic fight. After many rounds, in January 2013 the Chinese government agreed to the publication and started to post data from hundreds of measurement stations all across China. All our Chinese friends have smartphone apps that display the current Air Quality Index. Today it was 224. “Very Unhealthy”.
There is also an interesting website that publishes air quality across the world, wherever measurements are available: http://aqicn.org/
So, what if we compare to other polluted cities, like Amsterdam or New York?
Unfortunately, I could not find a live station in my old hometown Gothenburg, but a report stated that the year-average is 15-20 there.
The fact that numbers on air quality are published creates public awareness and political pressure to improve the situation in China. I predict a legal ban on petrol cars in the biggest cities within five years. Just like there was a ban on petrol scooters 10 years ago.
Today it costs nothing to pollute. That is a problem. This is arguably the most important challenge for Economy as a “science”, to create metrics for “externalities” and to find ways to measure and control destruction.
Part of the price for “Made in China” is the health effects and the environment impact here.
Next time you buy some cheap stuff, remember who pays.