This may be one of the easiest GE I've ever taken at UCLA, and I wish to write about the whole picture of this class in order to help future generation students who are considering to take this class.
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Grading Distribution: 23% Online Lessons&HWs + 25% Midterm + 40% Final + 12% Discussion Worksheets (6 assignments, 2% for each). This class assigns final grades on an absolute scale (93 = A) with no curve, while the A rate in class is still very high.
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About Online Lessons & HWs & Discussion: For the Online lessons and HWs, the lectures are all asynchronous and pre-recorded, with an interactive form on the website. There are quick questions after each short sub-lecture video, and are very simple. The six discussion assignments are quite easy and short, which just require you to spend less than half an hour for each to complete with your common sense. The five homework assignments are also very straightforward, which you can find all the answers on the internet for both lessons and hws.
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About Midterm and Final Exams: The midterm and final exams are ESSAY-STYLE, 3 hours to complete, instead of traditional exam form. Each exam consists of 4 essay questions, which require you to write for half a page for each. The questions are very very straightforward and easy to answer. Basically, all the exam questions are just asking you to integrate and repeat what you've learned in the lectures and the exam is open book, so I feel like I was just doing the copy from the lecture materials during the exams. Extremely easy to get above 95% in each exam or even full credit. Before the final, the TAs will even conduct review session and pose "review materials ppt" on the website, which from my perspective, they are actually are posing the exact answers of the final exam. Thus, the exams are really just a piece of cake as long as you follow the TAs step and you dont have to spend lots of time to study at all.
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About Professor Li and TAs: Even though the materials are all pre-recorded asynchronous stuff from other professors of previous years and I did not meet with professor Li, still I think Professor Li is a very nice, tolerant, and caring instructor. He is willing to extend the deadlines of the homeworks for a long period of time to adjust for his students' needs. I remember he extended the deadlines of each homework for average about 2-3 weeks (that even cannot be called a deadline), so you have great plenty of time to complete and review. Meanwhile, he was always there to help us solve the technical issue happened on the website. Also, the exam he designed are flexible 3-hour windows, which you can access any time in 2 complete days, to best fit your schedule. Speaking of TAs, I really really love my TA Katie Osborn. She is really nice, caring, professional, and cute. Her discussion session is well organized and her exam review materials are extremely helpful, while she is also very caring, being tolerant about absence. I would say take Katie's discussion session if it is available, and it will be very easy for you to get through the entire quarter in this class.
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Conclusion: Overall, this is a VERY VERY EASY A GE. The high flexibility of the class, easy contents and materials, as well as the great helpful TAs and professor will all help you to get an A in this class. In this class, you can spend the least amount of time to achieve the best grade, so it is absolutely worthy to take this class as a gpa booster.

I took AOS2 as an asynchronous online class, and the class was pretty easy. The work was mainly weekly lecture videos and quiz questions with occasional homework quizzes. The lecture quizzes had unlimited attempts, but the homework quizzes did not. The final was short answer and was graded very easily. It's very easy to do well in this class. Definitely recommend as a GE.

THE BEST CLASS I HAVE TAKEN AT UCLA!!! ALL ASYNC AND SO SO EASY. TRUST ME WHEN I SAY THIS IS THE CLASS TO TAKE. Not only is the professor the nicest person ever, you also learn important and relevant information about LA! The TAs are incredibly accommodating are are lenient with grading and also help you learn the material. I would take this class again in a heartbeat.
(Taken winter 2022)!!

The asynchronous online course I took, AOS2, was really simple. The majority of the work was comprised of weekly lecture videos and tests, along with occasional homework quizzes. The quizzes for the lectures allowed limitless attempts, but not the ones for the homework. The final was a short answer, and it was quite simple to grade. To perform well in this class is really simple. Absolutely suggest as a GE.

If you're not into science (specifically chemistry), this class will be extremely boring for you. Lectures are not super engaging, however the class itself is relatively easy. The midterm and the final are both a series of essay questions (no multiple choice) and while that may tend to scare students away, the questions are not difficult to answer. As long as you have a sufficient grasp of the content, you will be more than fine. Collaborate on discussion assignments--this is how you will learn and better understand the course.

This class was alright. If you have the option to take it online, as I did, you will probably be fine to take it as a Physical Science GE no matter how good at science you are. The material is fairly interesting, since you learn about air pollution in LA and it's not too technical. The math you have to do is pretty simple. If you are truly looking for the easiest possible way to knock out your science GEs, this probably isn't the class for you.

Interesting lectures, although I wish the math for some of the equations was explained more. The professor is very helpful during discussion and office hours.

Worst Professor I've ever met at the UCLA.
You will get the grade depending on your acting, not the grade you've got.If he likes you, you will get a good grade but if not, you never get good grade. I even don't know what my final grade is and asked him about my grade. HE NEVER ANSWER. He pretended to be nice throughout the quarter for evaluation sheet but if you finished it, he will change to be SOOooooo mean. NO replies, No care, even though you did gooooood job at the finals, your grade already been decided early before.

TAKE THIS PROFESSOR. SERIOUSLY. easiest A i have ever received in my life. Not only that, he genuinely cares about his students. He even made a facebook group where students can post homework questions and any questions that is related to the class, and he usually responds within 24 hours. His midterm and final exam was actually enjoyable. Professor Li wants you to succeed in his class and he would give very obvious hints on his exams. He basically WALKED THE CLASS THROUGH HIS FINAL. It doesn't get any easier than this and you actually will learn something.

- Professor Li is knowledgeable about the topics taught in this class, which primarily focused on the formation of clouds, aerosols and their effects to the atmosphere, and incoming/outgoing radiation.

- He simplified many of these topics way down and does tell you the bottom line about what is most essential for each one (towards homeworks and tests).

- There were many times where classes were boring, but at times, the topics proved to be very interesting.

- There were 6 homeworks (20% of grade). Initially, some of the problems looked more complicated than others, but he posts hints on the class Facebook page (yes, he uses a group page vs. an ‘unwieldy’ CCLE) and explains them with more detail in discussion (no TA for this class – he leads discussion).

- There was 1 midterm (30%) and a final (40%).

- He provides equation sheet and some hints during tests (though more hints were given during midterm than final).

- The concepts from lectures were focused on more in tests (versus homeworks, where more calculations are performed). Again, he says in lecture the bottom line for each topic, and they’re reflected in tests.

- He cared about student learning, as reflected by mentioning it many times (including stepping away from a job at JPL to become a professor) and his emphasis on student participation.

- Though participation is only 10% of grade, he’s as big a stickler of it as any professor I’ve ever had. He has you sign a sheet into each class and uses that to keep track of every student who attends each class, asks/answers questions, and occasionally calls on those who are quiet.

- Overall, as long as you comprehend the material and do well on the homeworks and tests, you will get a decent grade.