Photochemical smog was first observed in__________(city) and is formed from _________ and __________ in ________season

Photochemical smog was first observed in__________(city) and is formed

1.	Photochemical smog was first observed in__________(city) and is formed from _________ and __________ in ________season
Answer» ANSWER :LOS ANGELES, `NO_2` and HYDROCARBONS , SUMMER