Snowbird Ski & Summer Resort is offering a discount because of the inversion in the Salt Lake Valley.
Lift tickets are discounted by $20 on bad air days.
The resort said it is a reminder to people that there are blue skies at Snowbird.
The resort will post about the discount on its Facebook and Twitter accounts by 5 p.m. the say before it is available.
To redeem, just request the “Blue Bird Discount” at ticket counters.