I think this guy is a government propaganda artist. He said the same nonsense when I asked about it last year, but really it is quite bad. Maybe he just doesn’t have the faculties to detect pollution subjectively, like looking at a tall building or mountain and noticing the haze (the latter of which are often completely obstructed compared to the summer, depending on your vantage point), or as RBE pointed out, maybe he just cannot read numbers.
The pollution has been as bad as it was last year (i only have these 2 years as experiencial reference), and it basically lasts from October until May, ramping up heavily November to April. You can see it, and smell it, on a daily basis. If you watch the mountains like I mentioned earlier, you can see the difference after a few days of heavy rain, which have washed some of it down into the ground to partially reveal the mountain, then a few days later the mountain is obscured again. Again depending on the view, if you see the water, the horizon line is literally transformed into a gradient.
You could benefit from a heater in December, January, and February - especially some times in January - but it’s not really a big deal.