AQSQID: 230050029

Site Name: Portland - Deering Oaks

Location: Portland, ME

Reporting: True, Located: True

Current AQI: 29.0

Portland ME, US: 43.660248, -70.268967

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
May 25, 2019, 7 p.m. 3.2 ppb (3) 1.8 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 34.0 ppb (26) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 25, 2019, 6 p.m. 2.4 ppb (2) 1.4 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 34.0 ppb (26) N/A N/A 5.0 μg/m3 (21) 26.0
 
May 25, 2019, 5 p.m. 3.6 ppb (3) 1.9 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 25, 2019, 4 p.m. 4.1 ppb (4) 1.9 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 25, 2019, 3 p.m. 5.2 ppb (5) 2.2 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 25, 2019, 2 p.m. 4.6 ppb (4) 2.1 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 25, 2019, 1 p.m. 2.6 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 25, 2019, noon 3.5 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 24.0 ppb (18) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 25, 2019, 11 a.m. 4.3 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 19.0 ppb (15) N/A N/A 13.0 μg/m3 (52) 52.0
 
May 25, 2019, 10 a.m. 6.1 ppb (6) 1.3 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 15.0 ppb (12) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 25, 2019, 9 a.m. 7.0 ppb (6) 1.9 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 15.0 ppb (12) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 25, 2019, 8 a.m. 3.6 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 15.0 ppb (12) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 25, 2019, 7 a.m. 4.7 ppb (4) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 12.0 ppb (9) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 25, 2019, 6 a.m. 8.9 ppb (8) 0.5 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 9.0 ppb (7) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 25, 2019, 5 a.m. 13.6 ppb (13) 0.9 ppb (1) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 8.0 ppb (6) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 25, 2019, 4 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 14.0 ppb (11) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 25, 2019, 3 a.m. 13.1 ppb (12) 0.4 ppb (0) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 13.0 ppb (10) N/A N/A 14.0 μg/m3 (54) 54.0
 
May 25, 2019, 2 a.m. 27.2 ppb (25) 4.9 ppb (5) N/A 22.0 ppb (20) N/A 0.0 ppb (0) 4.0 ppb (3) N/A N/A 21.0 μg/m3 (69) 69.0
 
May 25, 2019, 1 a.m. 11.1 ppb (10) 0.3 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 18.0 ppb (14) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 25, 2019, midnight 9.2 ppb (9) 0.9 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 25.0 ppb (19) N/A N/A 5.0 μg/m3 (21) 21.0
 
May 24, 2019, 11 p.m. 6.0 ppb (6) 1.4 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 24, 2019, 10 p.m. 5.0 ppb (5) 1.7 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
May 24, 2019, 9 p.m. 6.1 ppb (6) 1.9 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 3.0 μg/m3 (12) 29.0
 
May 24, 2019, 8 p.m. 5.2 ppb (5) 1.8 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 5.0 μg/m3 (21) 32.0
 
May 24, 2019, 7 p.m. 4.3 ppb (4) 1.8 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 6.0 μg/m3 (25) 29.0
 
May 24, 2019, 6 p.m. 3.6 ppb (3) 1.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 6.0 μg/m3 (25) 27.0
 
May 24, 2019, 5 p.m. 3.3 ppb (3) 1.4 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 4.0 μg/m3 (17) 27.0
 
May 24, 2019, 4 p.m. 3.4 ppb (3) 1.5 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0
 
May 24, 2019, 3 p.m. 4.1 ppb (4) 1.8 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 25.0 ppb (19) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 24, 2019, 2 p.m. 4.7 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 22.0 ppb (17) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 24, 2019, 1 p.m. 4.1 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 28.0 ppb (22) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 24, 2019, noon 5.9 ppb (5) 1.2 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 27.0 ppb (21) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 24, 2019, 11 a.m. 3.9 ppb (4) 0.5 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 27.0 ppb (21) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 24, 2019, 10 a.m. 5.5 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 22.0 ppb (17) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 24, 2019, 9 a.m. 9.9 ppb (9) 0.6 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 16.0 ppb (12) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 24, 2019, 8 a.m. 5.1 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 20.0 ppb (15) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 24, 2019, 7 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 21.0 ppb (16) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 24, 2019, 6 a.m. 5.4 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 24.0 ppb (18) N/A N/A 5.0 μg/m3 (21) 21.0
 
May 24, 2019, 5 a.m. 5.7 ppb (5) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 27.0 ppb (21) N/A N/A 3.0 μg/m3 (12) 21.0
 
May 24, 2019, 4 a.m. 2.8 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 4.0 μg/m3 (17) 23.0
 
May 24, 2019, 3 a.m. 4.6 ppb (4) 0.1 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 24, 2019, 2 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 12.0 μg/m3 (50) 50.0
 
May 24, 2019, 1 a.m. 3.1 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 24, 2019, midnight 3.6 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 14.0 μg/m3 (54) 54.0
 
May 23, 2019, 11 p.m. 3.2 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 7.0 μg/m3 (29) 31.0
 
May 23, 2019, 10 p.m. 4.1 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 23, 2019, 9 p.m. 4.3 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 23, 2019, 8 p.m. 5.5 ppb (5) 1.2 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 23, 2019, 7 p.m. 3.7 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 23, 2019, 6 p.m. 3.6 ppb (3) 0.8 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 23, 2019, 5 p.m. 3.5 ppb (3) 1.1 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 8.0 μg/m3 (33) 34.0
 
May 23, 2019, 4 p.m. 4.4 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 5.0 μg/m3 (21) 30.0
 
May 23, 2019, 3 p.m. 4.0 ppb (4) 1.5 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 3.0 μg/m3 (12) 28.0
 
May 23, 2019, 2 p.m. 4.8 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 34.0 ppb (26) N/A N/A 5.0 μg/m3 (21) 26.0
 
May 23, 2019, 1 p.m. 4.2 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 34.0 ppb (26) N/A N/A 3.0 μg/m3 (12) 26.0
 
May 23, 2019, noon 6.4 ppb (6) 1.8 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 23, 2019, 11 a.m. 7.4 ppb (7) 1.2 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 23, 2019, 10 a.m. 6.2 ppb (6) 0.3 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 23, 2019, 9 a.m. 7.0 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 5.0 μg/m3 (21) 24.0
 
May 23, 2019, 8 a.m. 6.6 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 23, 2019, 7 a.m. 10.2 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 19.0 ppb (15) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 23, 2019, 6 a.m. 11.5 ppb (11) 0.1 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 17.0 ppb (13) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 23, 2019, 5 a.m. 9.8 ppb (9) 0.0 ppb (0) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 20.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 23, 2019, 4 a.m. 7.0 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 25.0 ppb (19) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 23, 2019, 3 a.m. 10.7 ppb (10) 0.1 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 22.0 ppb (17) N/A N/A 5.0 μg/m3 (21) 21.0
 
May 23, 2019, 2 a.m. 11.1 ppb (10) 0.1 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 23.0 ppb (18) N/A N/A 2.0 μg/m3 (8) 18.0
 
May 23, 2019, 1 a.m. 7.4 ppb (7) 0.4 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 2.0 μg/m3 (8) 22.0
 
May 23, 2019, midnight 6.5 ppb (6) 2.5 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0
 
May 22, 2019, 11 p.m. 4.2 ppb (4) 0.9 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 34.0 ppb (26) N/A N/A 6.0 μg/m3 (25) 26.0
 
May 22, 2019, 10 p.m. 4.1 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 34.0 ppb (26) N/A N/A 2.0 μg/m3 (8) 26.0
 
May 22, 2019, 9 p.m. 4.4 ppb (4) 2.2 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 34.0 ppb (26) N/A N/A 5.0 μg/m3 (21) 26.0
 
May 22, 2019, 8 p.m. 5.9 ppb (5) 3.1 ppb (3) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
May 22, 2019, 7 p.m. 6.2 ppb (6) 2.7 ppb (3) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 4.0 μg/m3 (17) 27.0
 
May 22, 2019, 6 p.m. 4.0 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 6.0 μg/m3 (25) 28.0
 
May 22, 2019, 5 p.m. 4.2 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
May 22, 2019, 4 p.m. 4.1 ppb (4) 1.7 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0
 
May 22, 2019, 3 p.m. 4.4 ppb (4) 1.9 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 22, 2019, 2 p.m. 4.1 ppb (4) 1.8 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 22, 2019, 1 p.m. 3.3 ppb (3) 1.4 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 5.0 μg/m3 (21) 24.0
 
May 22, 2019, noon 3.9 ppb (4) 1.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 3.0 μg/m3 (12) 22.0
 
May 22, 2019, 11 a.m. 4.6 ppb (4) 1.8 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 28.0 ppb (22) N/A N/A 4.0 μg/m3 (17) 22.0
 
May 22, 2019, 10 a.m. 3.9 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 28.0 ppb (22) N/A N/A 5.0 μg/m3 (21) 22.0
 
May 22, 2019, 9 a.m. 3.2 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 28.0 ppb (22) N/A N/A 5.0 μg/m3 (21) 22.0
 
May 22, 2019, 8 a.m. 2.2 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 5.0 μg/m3 (21) 22.0
 
May 22, 2019, 7 a.m. 1.9 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 22, 2019, 6 a.m. 1.0 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 22, 2019, 5 a.m. 1.0 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 6.0 μg/m3 (25) 27.0
 
May 22, 2019, 4 a.m. 1.2 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 6.0 μg/m3 (25) 28.0
 
May 22, 2019, 3 a.m. 1.7 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 2.0 μg/m3 (8) 27.0
 
May 22, 2019, 2 a.m. 2.2 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 2.0 μg/m3 (8) 25.0
 
May 22, 2019, 1 a.m. 3.1 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0
 
May 22, 2019, midnight 2.0 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
May 21, 2019, 11 p.m. 3.1 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 10 p.m. 2.2 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 21, 2019, 9 p.m. 2.7 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 21, 2019, 8 p.m. 2.5 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 7 p.m. 2.6 ppb (2) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
May 21, 2019, 6 p.m. 2.7 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 5.0 μg/m3 (21) 24.0
 
May 21, 2019, 5 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 4 p.m. 2.4 ppb (2) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
May 21, 2019, 3 p.m. 2.1 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 4.0 μg/m3 (17) 27.0
 
May 21, 2019, 2 p.m. 2.7 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 21, 2019, 1 p.m. 2.3 ppb (2) 0.8 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A N/A 24.0
 
May 21, 2019, noon 2.1 ppb (2) 0.7 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 27.0 ppb (21) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 21, 2019, 11 a.m. 4.1 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 19.0 ppb (15) N/A N/A 5.0 μg/m3 (21) 21.0
 
May 21, 2019, 10 a.m. 3.3 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 20.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 9 a.m. 5.6 ppb (5) 0.3 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 24.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 21, 2019, 8 a.m. 2.1 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 21, 2019, 7 a.m. 3.3 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 21, 2019, 6 a.m. 3.8 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (26) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 21, 2019, 5 a.m. 3.2 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 12.0 μg/m3 (50) 50.0
 
May 21, 2019, 4 a.m. 5.1 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 27.0 ppb (21) N/A N/A 12.0 μg/m3 (50) 50.0
 
May 21, 2019, 3 a.m. 14.9 ppb (14) 0.9 ppb (1) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 14.0 ppb (11) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 21, 2019, 2 a.m. 20.9 ppb (19) 0.5 ppb (0) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 14.0 ppb (11) N/A N/A 13.0 μg/m3 (52) 52.0
 
May 21, 2019, 1 a.m. 18.2 ppb (17) 0.8 ppb (1) N/A 17.0 ppb (16) N/A 0.0 ppb (0) 22.0 ppb (17) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 21, 2019, midnight 8.9 ppb (8) 0.4 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 17.0 μg/m3 (61) 61.0
 
May 20, 2019, 11 p.m. 12.2 ppb (11) 0.2 ppb (0) N/A 12.0 ppb (11) N/A 0.0 ppb (0) 27.0 ppb (21) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 10 p.m. 10.1 ppb (9) 1.6 ppb (1) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 20, 2019, 9 p.m. 8.6 ppb (8) 0.5 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 18.0 μg/m3 (63) 63.0
 
May 20, 2019, 8 p.m. 6.1 ppb (6) 1.2 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 54.0 ppb (42) N/A N/A 15.0 μg/m3 (56) 56.0
 
May 20, 2019, 7 p.m. 4.7 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 51.0 ppb (39) N/A N/A 15.0 μg/m3 (56) 56.0
 
May 20, 2019, 6 p.m. 10.4 ppb (10) 2.7 ppb (3) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 5 p.m. 13.8 ppb (13) 5.9 ppb (5) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 23.0 ppb (18) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 4 p.m. 23.4 ppb (22) 10.4 ppb (10) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 10.0 ppb (8) N/A N/A 16.0 μg/m3 (59) 59.0
 
May 20, 2019, 3 p.m. 22.8 ppb (21) 11.7 ppb (11) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 10.0 ppb (8) N/A N/A 16.0 μg/m3 (59) 59.0
 
May 20, 2019, 2 p.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A N/A 16.0 μg/m3 (59) 59.0
 
May 20, 2019, 1 p.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (8) N/A N/A 12.0 μg/m3 (50) 50.0
 
May 20, 2019, noon N/A N/A N/A N/A N/A N/A 9.0 ppb (7) N/A N/A 12.0 μg/m3 (50) 50.0
 
May 20, 2019, 11 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 10 a.m. 6.8 ppb (6) 1.7 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 17.0 ppb (13) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 9 a.m. 7.1 ppb (7) 1.7 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 18.0 ppb (14) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 20, 2019, 8 a.m. 8.1 ppb (8) 1.1 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 19.0 ppb (15) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 20, 2019, 7 a.m. 3.7 ppb (3) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 25.0 ppb (19) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 6 a.m. 2.3 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 20, 2019, 5 a.m. 2.4 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 4 a.m. 2.4 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, 3 a.m. 2.4 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 20, 2019, 2 a.m. 2.7 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 20, 2019, 1 a.m. 2.5 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 20, 2019, midnight 3.7 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 13.0 μg/m3 (52) 52.0
 
May 19, 2019, 11 p.m. 4.8 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 12.0 μg/m3 (50) 50.0
 
May 19, 2019, 10 p.m. 2.5 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 19, 2019, 9 p.m. 2.7 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 6.0 μg/m3 (25) 32.0
 
May 19, 2019, 8 p.m. 2.6 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 7.0 μg/m3 (29) 35.0
 
May 19, 2019, 7 p.m. 2.2 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (35) N/A N/A 8.0 μg/m3 (33) 35.0
 
May 19, 2019, 6 p.m. 2.7 ppb (3) 0.9 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, 5 p.m. 3.7 ppb (3) 0.9 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 19, 2019, 4 p.m. 3.9 ppb (4) 1.5 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 10.0 μg/m3 (42) 42.0
 
May 19, 2019, 3 p.m. 3.7 ppb (3) 0.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 19, 2019, 2 p.m. 3.2 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 1 p.m. 2.3 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 9.0 μg/m3 (38) 38.0
 
May 19, 2019, noon 4.2 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (28) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 11 a.m. 4.5 ppb (4) 0.9 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 4.0 μg/m3 (17) 22.0
 
May 19, 2019, 10 a.m. 4.6 ppb (4) 0.6 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 25.0 ppb (19) N/A N/A 3.0 μg/m3 (12) 19.0
 
May 19, 2019, 9 a.m. 3.9 ppb (4) 0.1 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 24.0 ppb (18) N/A N/A 5.0 μg/m3 (21) 21.0
 
May 19, 2019, 8 a.m. 8.5 ppb (8) 0.8 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 18.0 ppb (14) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, 7 a.m. 8.7 ppb (8) 0.3 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 18.0 ppb (14) N/A N/A 12.0 μg/m3 (50) 50.0
 
May 19, 2019, 6 a.m. 8.6 ppb (8) 0.9 ppb (1) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 18.0 ppb (14) N/A N/A 11.0 μg/m3 (46) 46.0
 
May 19, 2019, 5 a.m. 6.2 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 20.0 ppb (15) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 4 a.m. 4.6 ppb (4) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 24.0 ppb (18) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 19, 2019, 3 a.m. 6.7 ppb (6) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 24.0 ppb (18) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 19, 2019, 2 a.m. 5.8 ppb (5) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 26.0 ppb (20) N/A N/A 4.0 μg/m3 (17) 20.0
 
May 19, 2019, 1 a.m. 2.7 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 19, 2019, midnight 2.8 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 18, 2019, 11 p.m. 3.0 ppb (3) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 18, 2019, 10 p.m. 3.5 ppb (3) 1.3 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 8.0 μg/m3 (33) 33.0
 
May 18, 2019, 9 p.m. 3.9 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 7.0 μg/m3 (29) 29.0
 
May 18, 2019, 8 p.m. 3.3 ppb (3) 1.3 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0