Would you run today? Based on the visibility. Today is quite bad .
But if judged thru "smell" it doesn't smell that bad for me. I would run after the sunset .. but today I give myself a rest since I ran yesterday 10km. Planing a longer run for tmr morning . Hopefully
Already shared with you, it's the cardiovascular benefits:risks relationship mostly.
If you are more health biased, then dont do it. Plus gotta consider your nearly age 50 factor.
If your BYDSIM marathon timing is ultra important and number one factor in your mind right now and nothing else matters, then continue training. Maybe for some that is the only shot (accredited race) to go overseas majors next year etc.....that's a valid reason also.
There still is some net performance gain probably, since the air is not way over AQI 200 (leading to clear and lasting symptoms and inflammation which affects your next few sessions so it's LPPL).
I just checked with AI, it's telling me the same. Performance fitness gain yes, though hampered a bit coz of recovery hits etc. You can still train for say Garmin/BYDSIM and net benefits.
But you are trading this with health risks/benefits.
Or put it this way bro, it's like you are fuelling mostly with instant noodles laden with inflammatory oil + lots of palm oil addition, maybe 4-6 packets a day something like that.
So you will not bonk, performance will still be there since the carbs/glycogen will be supplied by it. But got
加料。
So need to see how you view things overall. Fitness (your BYDSIM marathon timing) vs your health.
You will get fit and net a good timing, but at what expense. You can only answer that yourself as everyone views risks and life differently.
Some more science in this
https://www.trainingpeaks.com/blog/...ts-performance-what-athletes-can-do-about-it/
How Poor Air Quality Affects Performance & What Athletes Can Do About It
By Will Hicks
Updated August 14, 2026 Published August 4, 2026