Bad Air Days in Guayama, Puerto Rico

Not enough data

EPA monitors in Guayama ran on too few days between 2016 and 2025 to give a fair yearly count (about 14% of days covered). Neighbouring counties below are a better guide.

What actually helps here

EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.

Better or worse than it was

Date	AQI	Main pollutant
2017-05-22	85	PM2.5
2017-05-25	84	PM2.5
2020-09-03	82	PM2.5
2021-08-23	77	PM2.5
2016-04-24	73	PM2.5

Most days, not the worst ones

Across 464 monitored days from 2016 to 2025, the air in Guayama rated Good on 88% of them, more often than the 72% typical of monitored counties, and Moderate on 12%. The median day sat at AQI 23; one day in ten went above 47.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)57%264 days
coarse dust (PM10)43%200 days

Year by year

Year	Days monitored	Good	Moderate	Median AQI	Highest AQI
2025*	50	49	1	19	52
2024	52	51	1	15	53
2023	59	57	2	15	55
2022	67	65	2	16	67
2021	54	39	15	28	77
2020	34	26	8	31	82
2019	2	2	0	29	29
2017	44	36	8	37	85
2016	102	85	17	28	73
2015	110	91	19	25	68
2014	106	98	8	19	59
2013	123	117	6	21	57
2012	122	103	19	22	70
2011	112	102	10	23	61
2010	117	105	12	18	86

*2025 may be a partial year in EPA's file.

Elsewhere in Puerto Rico

Catano11/yr
Juncos5/yr
Bayamon3/yr
Mayagnez3/yr
Ponce2/yr
Guaynabo2/yr
Caguas1/yr
Fajardothin data

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.