for more on thato abc 7 news reporter live in san francisco.for more on that let' abc 7 news reporter live in san francisco. >> reporter: this is typically the time people come to this park to walk their canines. you can see completely empty. clearly people are keeping their dogs inside, safely inside. for me, there were a few ah-ha moments. in all my years living in san francisco, i've never seen the park this empty. the national park is usually parked with dogs. she's a dog walker. because of the unhealthy air she limited the time spent out with her animals. >> didn't pass any dog walkers today. we must have passed maybe two people. the people was like our own private beach. it was awesome. >> reporter: we ran into harr t harriette. her owner said conditions have not been good for the dog. >> i don't take them out for as long as i usually do. because she's coughing so much, i'm having to hold her a lot. >> reporter: this woman posted a picture of her dog with a small bandana covering its face which doesn't do much good. masks aren't really effective either. >> they probably wouldn't