3 ms·

Thanks for the link, i was wondering if maybe shanghai had a different kind of pollution that i wouldn't notice (i can't really tell from the graph, but i think

by bsaul 9y ago

Thanks for the link, i was wondering if maybe shanghai had a different kind of pollution that i wouldn't notice (i can't really tell from the graph, but i think maybe pm10 is something that you'd feel more). Although they're both globally in the "yellow" range.. CNY is really over now. Some shops were closed last week, but everything's been back to normal for the last three days.. Also, Paris is experiencing a unusual freezing temperature, so maybe there's less activity. Do you know if there are some historical data on the site ? i'd be really interested to compare the days i left Paris with the day i arrived in Shanghai, because the difference was really amazing. EDIT : looking more closely at the shanghai map.. If the location is really precise, then it seems that the indicators are all set close to the huge circle roads surrounding the central city. If you want to compare that with the paris equivalent (and not the indicators next to the river), you'll find the same kind of values.

seanmcdirmid 9y ago
CNY isn’t really over for another week or even two. The lull in traffic usually lasts for around three weeks. Even if the shops are open, many haven’t returned from vacation yet. Pm2.5 is the big killer that everyone is worried about these days. PM10 is larger particles like dust which should be less of a problem in SH. Historical data is included on site, but no easy way to compare them. There isn’t a place in shanghai that isn’t next to a major road, it’s a city of 10 million. They used to try and game the system by putting AQI stations out in the suburbs but these days those places actually have worse pollution.
- bsaul 9y ago
  The big circles around shanghai are a completely different beast than just "major road". Just like Paris "périphérique" is in a league of its own. I've had a 6h foot walk just 2 days ago in shanghai (inside the first circle, travelling all around the city), and i can tell you the amount of dust i inhaled was nothing compare to what i'm feeling when i walk inside Paris. Now maybe CNY is a huge factor indeed, unfortunately i won't be there anymore to see for myself... All i can say then is that it's a great time to visit the city ! :)
  - seanmcdirmid 9y ago
    I've been to SH plenty of time and I know about the ring road topology (same as Beijing actually). But if you look at the map, it just gets worse, not better, as you get farther from the center. CNY is a great time to visit Shanghai, Beijing, Shenzhen, and Guangzhou, since people there either (a) go home (they aren't locals) or (b) go on vacation somewhere else far away. CNY practically lasts longer than the official golden week, so traffic is light as well.

by bsaul 9y ago

seanmcdirmid 9y ago

CNY isn’t really over for another week or even two. The lull in traffic usually lasts for around three weeks. Even if the shops are open, many haven’t returned from vacation yet. Pm2.5 is the big killer that everyone is worried about these days. PM10 is larger particles like dust which should be less of a problem in SH. Historical data is included on site, but no easy way to compare them. There isn’t a place in shanghai that isn’t next to a major road, it’s a city of 10 million. They used to try and game the system by putting AQI stations out in the suburbs but these days those places actually have worse pollution.

bsaul 9y ago
The big circles around shanghai are a completely different beast than just "major road". Just like Paris "périphérique" is in a league of its own. I've had a 6h foot walk just 2 days ago in shanghai (inside the first circle, travelling all around the city), and i can tell you the amount of dust i inhaled was nothing compare to what i'm feeling when i walk inside Paris. Now maybe CNY is a huge factor indeed, unfortunately i won't be there anymore to see for myself... All i can say then is that it's a great time to visit the city ! :)
- seanmcdirmid 9y ago
  I've been to SH plenty of time and I know about the ring road topology (same as Beijing actually). But if you look at the map, it just gets worse, not better, as you get farther from the center. CNY is a great time to visit Shanghai, Beijing, Shenzhen, and Guangzhou, since people there either (a) go home (they aren't locals) or (b) go on vacation somewhere else far away. CNY practically lasts longer than the official golden week, so traffic is light as well.