I love taking walks in the day.
The reason I love this is because of the part in which I live in.
It does not matter what time of the year it is, the air quality is consistently attractive that time of the day. It is almost like having a whole apartment air purification plan all around you from mother nature herself! You can not get any better air quality than what the people I was with and I get year round in the afternoons here, then even if it is warm summer time or cold winter, the outdoor air quality is good all the time from about 7am to around 10am. After that, depending on the time of year the air quality may be soso or bad. You never know. But a single thing is for sure, and that is the afternoons will consistently have good air quality. Most people around here do not have whole apartment air purification systems or even portable whole-house air purifiers. But those that do never have to use them in the day times, which is great because it saves money on electric bills. Most whole apartment air purification systems run through the central heating and cooling system, so that in itself takes a lot of energy use to run and in turn jacks up the bills. But I will more than tell you that in the fall weeks the air quality is good for a walk any time of the afternoon or night. You can also open up all the windows in your apartment that time of the year as well.