Smog makes arthritis flare! Study of air pollution & flares in 888 RA pts. With higher air pollution, 70% ⬆️risk of ⬆️CRP. Pts Nitric oxide exposed cumulative over 60 days had higher DAS but <5% of drug changes explained by air pollution. OP0178 @RheumNow @eular_org #EULAR2021