Bad Air Days in Grady County, Oklahoma: 0 a Year

0 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 980 of 996 monitored counties, where 1 is worst.

Is a purifier worth it here?

Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
On the odd bad day, check AirNow and keep windows shut.

Better or worse than it was

Date	AQI	Main pollutant
2016-03-21	33	NO2
2016-03-14	24	NO2
2016-07-21	23	NO2
2016-02-25	21	NO2
2016-03-25	21	NO2

Most days, not the worst ones

Across 380 monitored days from 2016 to 2017, the air in Grady County rated Good on 100% of them, more often than the 72% typical of monitored counties, and Moderate on 0%. The median day sat at AQI 9; one day in ten went above 16.

The pollutant setting the AQI on an ordinary day here:

nitrogen dioxide100%380 days

Grady County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2017	94	94	0	0	0	8	20
2016	286	286	0	0	0	9	33

Elsewhere in Oklahoma

How this is counted

A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.