The longest day of the year in the southern hemisphere is:
december 21
march 21
june 21
september 21

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?

In general, are there any major differences that you can see? explain

What best describes emerging scientific ideas